15607
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
- 1
Divisibility
- Divisor Count
- 2
- Divisor Sum
- 15608
- Proper Divisor Sum (Aliquot Sum)
- 1
- Abundant Number
- no
- Perfect Number
- no
- Deficient Number
- yes
- Weird Number
- no
- Untouchable Number
- no
- Primitive Abundant
- no
Derived Values
- Euler's Totient
- 15606
- Möbius Function
- -1
- Radical
- 15607
- 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
- 146
- 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
- no
- Powerful Number
- no
- Achilles Number
- no
- Prime Index
- 1820
- Perfect Power
- no
- Smooth Number
- no
- Carmichael Number
- no
Classification
- Even
- no
- Odd
- yes
Appears in sequences
- Numbers k such that the period of the continued fraction for sqrt(k) contains exactly 82 ones.at n=15A031850
- Denoting 5 consecutive primes by p, q, r, s and t, these are the values of q such that q, r and s have 10 as a primitive root, but p and t do not.at n=33A060261
- Number of generalized {(1,2),(1,-1)}-Dyck paths of length 3n with no peaks at level 2.at n=8A089354
- Primes of the form 6*k^2 + 1.at n=15A090687
- Number of n-digit base-7 deletable primes.at n=8A096240
- Primes from merging of 5 successive digits in decimal expansion of Catalan's constant.at n=23A104919
- Primes p such that q = 4p^2 + 1 and r = 4q^2 + 1 are also prime.at n=24A122424
- Mother primes of order 8.at n=27A136067
- Primes of the form 210k + 67.at n=37A140855
- Primes congruent to 41 mod 43.at n=38A142290
- Primes congruent to 25 mod 49.at n=37A142435
- Primes congruent to 25 mod 53.at n=37A142555
- Primes congruent to 31 mod 59.at n=29A142758
- Primes congruent to 52 mod 61.at n=29A142850
- Primes p such that p+p^2+p^3-+2 are also prime.at n=26A154821
- a(n) = 54*n^2 + 1.at n=17A158646
- Primes p such that p-1 and p+1 each contain at least one cubed prime in their prime factorization.at n=22A162870
- Prime factors in a divisibility sequence of the Lucas sequence v(P=3,Q=5) of the second kind.at n=11A164816
- a(n) = n^3 mod (n-th prime squared).at n=31A167623
- Primes p such that 2*p^4+-9 are also prime.at n=12A174365