9631
domain: N
Properties
Digital Properties
- Digit Count
- 4
- Digit Sum
- 19
- Digital Root
- 1
- Palindromic Number
- no
- Repdigit
- no
- Automorphic
- no
- Kaprekar Number
- no
- Multiplicative Persistence
- 3
Divisibility
- Divisor Count
- 2
- Divisor Sum
- 9632
- 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
- 9630
- Möbius Function
- -1
- Radical
- 9631
- 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
- 158
- 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
- yes
- Mersenne Prime
- no
- Sophie Germain Prime
- no
- Safe Prime
- no
- Powerful Number
- no
- Achilles Number
- no
- Prime Index
- 1190
- Perfect Power
- no
- Smooth Number
- no
- Carmichael Number
- no
Classification
- Even
- no
- Odd
- yes
Appears in sequences
- a(n) = n^2 written backwards.at n=36A002942
- Primes whose reversal is a square.at n=12A007488
- Expansion of 1/(1-x^10-x^11-x^12-x^13-x^14-x^15-x^16-x^17-x^18).at n=72A017894
- Arrange digits of squares in descending order.at n=37A028908
- Arrange digits of squares in descending order.at n=44A028908
- 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 97.at n=23A031595
- Numbers k such that the period of the continued fraction for sqrt(k) contains exactly 52 ones.at n=23A031820
- Primes whose consecutive digits differ by 2 or 3.at n=45A048414
- n plus a googol is prime.at n=27A049014
- Primes with distinct digits in descending order.at n=49A052014
- Numbers k such that 9*10^k - 1 is prime.at n=9A056725
- Prime lucky numbers k (from A031157) such that nextprime(k)=nextlucky(k).at n=15A057698
- Primes p such that x^18 = 2 has no solution mod p, but x^6 = 2 has a solution mod p.at n=19A059664
- Primes p such that x^54 = 2 has no solution mod p, but x^6 = 2 has a solution mod p.at n=20A059665
- Primes p such that x^36 = 2 has no solution mod p, but x^12 = 2 has a solution mod p.at n=14A059668
- Squares of 1 and primes, written backwards.at n=12A060998
- Integers m such that A064992(m) = A064992(m+1).at n=13A065002
- Sequence of prime numbers whose reverse is a nontrivial prime power (A025475).at n=9A067194
- Primes whose digit reversal is a nontrivial power.at n=15A069798
- n^2 read backwards, for n = 51, 50, 49, ..., 1.at n=14A080334