15625
domain: N
Properties
Digital Properties
- Digit Count
- 5
- Digit Sum
- 19
- Digital Root
- 1
- Palindromic Number
- no
- Repdigit
- no
- Automorphic
- no
- Kaprekar Number
- no
- Multiplicative Persistence
- 2
Divisibility
- Divisor Count
- 7
- Divisor Sum
- 19531
- Proper Divisor Sum (Aliquot Sum)
- 3906
- Abundant Number
- no
- Perfect Number
- no
- Deficient Number
- yes
- Weird Number
- no
- Untouchable Number
- no
- Primitive Abundant
- no
Derived Values
- Euler's Totient
- 12500
- Möbius Function
- 0
- Radical
- 5
- Omega Function (Ω)
- 6
- 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
- yes
- Pentagonal Number
- no
- Hexagonal Number
- no
- Lucas Number
- no
- Tetrahedral Number
- no
- Pell Number
- no
- Tribonacci Number
- no
- Pronic Number
- no
Recreational
- Happy Number
- yes
- Harshad Number
- no
- Narcissistic Number
- no
- Collatz Steps
- 146
- Smith Number
- no
- Vampire 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
Appears in sequences
- Powers of 5: a(n) = 5^n.at n=6A000351
- The cubes: a(n) = n^3.at n=25A000578
- Sixth powers: a(n) = n^6.at n=5A001014
- Numbers of the form 3^i*5^j with i, j >= 0.at n=33A003593
- Numbers of the form 5^i*7^j with i, j >= 0.at n=20A003595
- Numbers of the form 5^i * 11^j.at n=18A003598
- Square array read by upwards antidiagonals: T(n,k) = n^k for n >= 0, k >= 0.at n=72A003992
- Array read by ascending antidiagonals: A(n, k) = k^n.at n=71A004248
- Numbers that are the sum of at most 2 nonzero 6th powers.at n=15A004853
- Numbers that are the sum of at most 3 nonzero 6th powers.at n=35A004854
- Smallest label f(T) given to a rooted tree T with n nodes in Matula-Goebel labeling.at n=18A005517
- Least hypotenuse of n distinct Pythagorean triangles.at n=6A006339
- a(n) = n^(n+1).at n=5A007778
- a(n) = Product_{j=0..5} floor((n+j)/6).at n=30A008881
- Squares formed by concatenating other squares, not ending in 0.at n=21A009404
- Powers of 25.at n=3A009969
- Triangle in which j-th entry in i-th row is (j+1)^(i-j).at n=59A009998
- Triangle in which j-th entry in i-th row is (i+1-j)^j, 0<=j<=i.at n=61A009999
- Triangle of coefficients in expansion of (1+5x)^n.at n=27A013612
- Triangle of coefficients in expansion of (2+5x)^n.at n=27A013621