2903
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
- 1
Divisibility
- Divisor Count
- 2
- Divisor Sum
- 2904
- Proper Divisor Sum (Aliquot Sum)
- 1
- 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
- 2902
- Möbius Function
- -1
- Radical
- 2903
- Omega Function (Ω)
- 1
- 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
- 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
- yes
- Harshad Number
- no
- Narcissistic Number
- no
- Collatz Steps
- 141
- Smith Number
- no
- Vampire Number
- no
Primality
- Prime
- yes
- Composite Number
- no
- Semiprime
- no
- Squarefree Number
- yes
- Prime Power
- yes
- Prime Factorization
- no
- Twin Prime
- no
- Mersenne Prime
- no
- Sophie Germain Prime
- yes
- Safe Prime
- yes
- Powerful Number
- no
- Achilles Number
- no
- Prime Index
- 420
- Perfect Power
- no
- Smooth Number
- no
- Carmichael Number
- no
Classification
- Even
- no
- Odd
- yes
Appears in sequences
- Primes p == 7, 19, 23 (mod 40) such that (p-1)/2 is also prime.at n=24A000353
- Primes p == 3, 9, 11 (mod 20) such that 2p+1 is also prime.at n=37A000355
- Length of one version of Kolakoski sequence {A000002(i)} at n-th growth stage.at n=20A001083
- Lucasian primes: p == 3 (mod 4) with 2*p+1 prime.at n=41A002515
- Safe primes p: (p-1)/2 is also prime.at n=47A005385
- Balanced primes (of order one): primes which are the average of the previous prime and the following prime.at n=27A006562
- Coordination sequence T1 for Zeolite Code BIK.at n=32A008047
- Coordination sequence T1 for Zeolite Code MON.at n=33A008181
- Coordination sequence T1 for Zeolite Code TER.at n=36A016433
- Coordination sequence T8 for Zeolite Code TER.at n=36A016440
- Fibonacci sequence beginning 1, 32.at n=11A022402
- Primes that remain prime through 2 iterations of the function f(x) = 2x + 7.at n=34A023244
- Primes that remain prime through 2 iterations of function f(x) = 8x + 3.at n=29A023261
- a(n) = prime(10*n).at n=41A031343
- Numbers k such that the continued fraction for sqrt(k) has even period and if the last term of the periodic part is deleted the central term is 53.at n=9A031551
- Primes of form x^2 + 94*y^2.at n=23A033204
- Number of partitions of n with equal number of parts congruent to each of 3 and 4 (mod 5).at n=34A035561
- Numbers k such that the string 0,3 occurs in the base 10 representation of k but not of k-1.at n=30A044335
- Numbers n such that string 0,3 occurs in the base 10 representation of n but not of n+1.at n=30A044716
- F-primes.at n=21A046872