625
domain: N
Properties
Digital Properties
- Digit Count
- 3
- Digit Sum
- 13
- Digital Root
- 4
- Palindromic Number
- no
- Repdigit
- no
- Automorphic
- yes
- Kaprekar Number
- no
- Multiplicative Persistence
- 2
Divisibility
- Divisor Count
- 5
- Divisor Sum
- 781
- Proper Divisor Sum (Aliquot Sum)
- 156
- Abundant Number
- no
- Perfect Number
- no
- Deficient Number
- yes
- Highly Composite
- no
- Weird Number
- no
- Untouchable Number
- no
- Primitive Abundant
- no
Derived Values
- Euler's Totient
- 500
- Möbius Function
- 0
- Radical
- 5
- Omega Function (Ω)
- 4
- Little Omega Function (ω)
- 1
Special
- Factorial
- no
- Catalan Number
- no
- Bell Number
- no
- Motzkin Number
- no
- Primorial
- no
Figurate Numbers
- Fibonacci Number
- no
- Triangular Number
- no
- Perfect Square
- yes
- Perfect Cube
- no
- Pentagonal Number
- no
- Hexagonal Number
- no
- Lucas Number
- no
- Tetrahedral Number
- no
- Pell Number
- no
- Tribonacci Number
- no
- Pronic Number
- no
Recreational
- Happy Number
- no
- Harshad Number
- no
- Narcissistic Number
- no
- Collatz Steps
- 25
- Smith Number
- no
Primality
- Prime
- no
- Composite Number
- yes
- Semiprime
- no
- Squarefree Number
- no
- Prime Power
- yes
- Prime Factorization
- no
- Twin Prime
- no
- Mersenne Prime
- no
- Sophie Germain Prime
- no
- Safe Prime
- no
- Powerful Number
- yes
- Achilles Number
- no
- Perfect Power
- yes
- Smooth Number
- yes
- Carmichael Number
- no
Classification
- Even
- no
- Odd
- yes
Names
- German
- sechshundertfünfundzwanzig· ordinal: sechshundertfünfundzwanzigste
- English
- six hundred twenty-five· ordinal: six hundred twenty-fifth
- Spanish
- seiscientos veinticinco· ordinal: 625º
- French
- six cent vingt-cinq· ordinal: six cent vingt-cinqième
- Italian
- seicentoventicinque· ordinal: 625º
- Latin
- sescenti viginti quinque· ordinal: 625.
- Portuguese
- seiscentos e vinte e cinco· ordinal: 625º
Appears in sequences
- Number of labeled rooted trees with n nodes: n^(n-1).at n=4A000169
- Numbers m such that Fibonacci(m) ends with m.at n=23A000350
- Powers of 5: a(n) = 5^n.at n=4A000351
- Numbers that are the sum of 2 squares in exactly 3 ways.at n=2A000443
- n followed by n^2.at n=49A000463
- Number of partially labeled rooted trees with n nodes (4 of which are labeled).at n=1A000525
- Fourth powers: a(n) = n^4.at n=5A000583
- Numbers n such that the sum of the squares of n consecutive positive odd numbers x^2 + (x+2)^2 + ... + (x+2n-2)^2 = k^2 for some integer k. The least values of x and k for each n are in A056131 and A056132, respectively.at n=39A001033
- Perfect powers: m^k where m > 0 and k >= 2.at n=33A001597
- Powerful numbers, definition (1): if a prime p divides n then p^2 must also divide n (also called squareful, square full, square-full or 2-powerful numbers).at n=40A001694
- Generalized Stirling numbers, [n+8,8]_4.at n=2A001719
- a(n) = Fibonacci(n) + n.at n=15A002062
- Expansion of a modular function for Gamma_0(14).at n=12A002509
- Quarter-squares: a(n) = floor(n/2)*ceiling(n/2). Equivalently, a(n) = floor(n^2/4).at n=50A002620
- Squares and cubes.at n=31A002760
- Automorphic numbers: m^2 ends with m.at n=7A003226
- Numbers that are the sum of 5 positive 4th powers.at n=38A003339
- Numbers of the form 2^i*5^j with i, j >= 0.at n=25A003592
- Numbers of the form 3^i*5^j with i, j >= 0.at n=16A003593
- Numbers of the form 5^i*7^j with i, j >= 0.at n=10A003595