Properties of the Number 31223

Thirty-One Thousand Two Hundred Twenty-Three

Basics

Value: 31222 → 31223 → 31224

Parity: odd

Prime: Yes

Previous Prime: 31219

Next Prime: 31231

Digit Sum: 11

Digital Root: 2

Palindrome: No

Factorization: 31223

Divisors: 1, 31223

Polygonal

Triangular: No

Square: No

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: No

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Representations

Binary: 111100111110111

Octal: 74767

Duodecimal: 1609B

Hexadecimal: 79f7

Square: 974875729

Square Root: 176.7003112617519

Classification

Fibonacci: No

Bell Number: No

Factorial Number: No

Regular Number: No

Perfect Number: No

Special

Kaprekar Constant: No

Munchausen Constant: No

Armstrong Number: No

Kaprekar Number: No

Catalan Number: No

Vampire Number: No

Taxicab Number: No

Super Prime: No

Friedman Number: No

Fermat Number: No

Cullen Number: No

OEIS Sequences

Number of permutations P of {1,2,...,n} such that P(1)=1 and |P^-1(i+1)-P^-1(i)| equals 1 or 2 for i=1,2,...,n-1. A38718

Primes whose decimal representation is a valid number in base 5 and interpreted as such is again a prime. A90708

Row 4 of table A162424. A162427

Square array read by antidiagonals upwards: T(n,k) for integer k >= 0 is the n-th prime p such that p^{2·3^k} + p^{3^k} + 1 is prime. A344448

Successive primes generated in A379355. A379782

Discriminants of totally complex sextic fields (negated). A23687

Primes p such that q = p² + p + 1 is an emirp. A178545

a(1) = 3 ; a(n+1) is the prime number obtained by the concatenation {p, a(n)} where p is the smallest prime prefix. A202997

Position of 1/n in the ordering of the rationals given by application of the map t -> (1+t,-1/t), cf. A226130. A226274

Primes p such that the sum of the cubes of digits of p equals the sum of digits of p³. A291052