Properties of the Number 31313

Thirty-One Thousand Three Hundred Thirteen

Basics

Value: 31312 → 31313 → 31314

Parity: odd

Prime: No

Previous Prime: 31307

Next Prime: 31319

Digit Sum: 11

Digital Root: 2

Palindrome: Yes

Factorization: 173 × 181

Divisors: 1, 173, 181, 31313

Polygonal

Triangular: No

Square: No

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: No

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Representations

Binary: 111101001010001

Octal: 75121

Duodecimal: 16155

Hexadecimal: 7a51

Square: 980503969

Square Root: 176.9547964876906

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

a(n) = prime(n)*prime(n+2). A90076

Sequence of pairwise relatively prime numbers of class P₅ (see comment in A275246). A275249

"Sloping binary representation" of powers of 3 (A000244), slope = -1. A37095

Numbers k such that exactly three d in the range d <= k/2 exist which divide binomial(k-d-1,d-1) and which are not coprime to k. A178099

Array read by antidiagonals: A(n,k) is the number of nonequivalent binary matrices with k columns and any number of distinct nonzero rows with n ones in every column up to permutation of rows and columns. A331510

Base-10 palindromes that starts with 3. A43038

Palindromic primes in base 4 (written in base 4). A117699

Octal palindromes which are also primes. A6341

Palindromic composite numbers starting with a digit 3. A222726

Start with 1. Successive digits in the sequence must differ by 2. Adjoin the smallest number not yet in the sequence. A228328