2525
domain: N
Properties
Digital Properties
- Digit Count
- 4
- Digit Sum
- 14
- Digital Root
- 5
- Palindromic Number
- no
- Repdigit
- no
- Automorphic
- no
- Kaprekar Number
- no
- Multiplicative Persistence
- 2
Divisibility
- Divisor Count
- 6
- Divisor Sum
- 3162
- Proper Divisor Sum (Aliquot Sum)
- 637
- 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
- 2000
- Möbius Function
- 0
- Radical
- 505
- Omega Function (Ω)
- 3
- Little Omega Function (ω)
- 2
Special
- Factorial
- no
- Catalan Number
- no
- Bell Number
- no
- Motzkin Number
- no
- Primorial
- no
Figurate Numbers
- Fibonacci Number
- no
- Triangular Number
- no
- Perfect Square
- no
- 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
- 40
- Smith Number
- no
- Vampire Number
- no
Primality
- Prime
- no
- Composite Number
- yes
- Semiprime
- no
- Squarefree Number
- no
- Prime Power
- no
- Prime Factorization
- no
- Twin Prime
- no
- Mersenne Prime
- no
- Sophie Germain Prime
- no
- Safe Prime
- no
- Powerful Number
- no
- Achilles Number
- no
- Perfect Power
- no
- Smooth Number
- no
- Carmichael Number
- no
Classification
- Even
- no
- Odd
- yes
Appears in sequences
- Coefficient of q^(2n-1) in the series expansion of Ramanujan's mock theta function f(q).at n=34A000199
- Numbers that are the sum of 2 squares in exactly 3 ways.at n=23A000443
- Discriminants of totally real quartic fields (see comments).at n=7A002769
- a(n) = 5*a(n-1) - a(n-2), with a(0) = 2, a(1) = 5.at n=5A003501
- Number of points on surface of square pyramid: 3*n^2 + 2 (n>0).at n=29A005918
- a(n) = n*(4*n+1).at n=25A007742
- Coordination sequence T1 for Zeolite Code MTT.at n=31A008189
- Coordination sequence T7 for Zeolite Code MTW.at n=33A008202
- Numbers k such that k | 4^k + 1.at n=7A015950
- Numbers k such that k | 9^k + 1.at n=7A015957
- Numbers k such that k | 14^k + 1.at n=37A015965
- Numbers k that divide 4^k + 1, k not a power of 5.at n=2A015974
- Coordination sequence T6 for Zeolite Code TER.at n=34A016438
- Doublets: base-10 representation is the juxtaposition of two identical strings.at n=24A020338
- Expansion of Product_{m>=1} (1 + m*q^m).at n=16A022629
- Place where n-th 1 occurs in A023119.at n=43A022781
- Positive numbers k such that k and 2*k are anagrams in base 8 (written in base 8).at n=9A023073
- Discriminants of totally real quartic fields.at n=8A023680
- Numbers that are the sum of 2 nonzero squares in exactly 3 ways.at n=21A025286
- Numbers that are the sum of 2 nonzero squares in 3 or more ways.at n=28A025294