1907
domain: N
Properties
Digital Properties
- Digit Count
- 4
- Digit Sum
- 17
- Digital Root
- 8
- Palindromic Number
- no
- Repdigit
- no
- Automorphic
- no
- Kaprekar Number
- no
- Multiplicative Persistence
- 1
Divisibility
- Divisor Count
- 2
- Divisor Sum
- 1908
- 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
- 1906
- Möbius Function
- -1
- Radical
- 1907
- 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
- no
- Harshad Number
- no
- Narcissistic Number
- no
- Collatz Steps
- 29
- 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
- no
- Safe Prime
- yes
- Powerful Number
- no
- Achilles Number
- no
- Prime Index
- 292
- Perfect Power
- no
- Smooth Number
- no
- Carmichael Number
- no
Classification
- Even
- no
- Odd
- yes
Appears in sequences
- Number of positive integers <= 2^n of form x^2 + 3 y^2.at n=13A000205
- Number of 5-dimensional partitions of n.at n=6A000390
- Numbers that are the sum of 10 positive 6th powers.at n=28A003366
- Safe primes p: (p-1)/2 is also prime.at n=36A005385
- Numbers k such that (11^k - 1)/10 is prime.at n=5A005808
- From relations between Siegel theta series.at n=17A006476
- Balanced primes (of order one): primes which are the average of the previous prime and the following prime.at n=23A006562
- Where the prime race among 7k+1, ..., 7k+6 changes leader.at n=17A007354
- Primes of form x^3 + y^3 + z^3 where x,y,z > 0.at n=44A007490
- Number of lattice points inside circle of radius n is 4(a(n)+n)-3.at n=49A007882
- Coordination sequence T1 for Zeolite Code AFT.at n=33A008026
- Coordination sequence T2 for Zeolite Code AFY.at n=36A008030
- Coordination sequence T1 for Zeolite Code MTT.at n=27A008189
- Coordination sequence T1 for Zeolite Code TON.at n=27A008241
- Smallest nonempty set S containing prime divisors of 9k+8 for each k in S.at n=47A020630
- n-th prime p(k) such that p(k) + p(k+6) = p(k+2) + p(k+4).at n=32A022891
- Primes that remain prime through 2 iterations of the function f(x) = 2x + 7.at n=27A023244
- Primes that remain prime through 2 iterations of the function f(x) = 5x + 4.at n=21A023253
- Primes that remain prime through 2 iterations of function f(x) = 6x + 1.at n=23A023256
- Primes that remain prime through 3 iterations of function f(x) = 5x + 4.at n=7A023284