Properties of the Number 31215

Thirty-One Thousand Two Hundred Fifteen

Basics

Value: 31214 → 31215 → 31216

Parity: odd

Prime: No

Previous Prime: 31193

Next Prime: 31219

Digit Sum: 12

Digital Root: 3

Palindrome: No

Factorization: 3 × 5 × 2081

Divisors: 1, 3, 5, 15, 2081, 6243, 10405, 31215

Polygonal

Triangular: No

Square: No

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: No

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Representations

Binary: 111100111101111

Octal: 74757

Duodecimal: 16093

Hexadecimal: 79ef

Square: 974376225

Square Root: 176.67767261315166

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

T(n,k)=Number of (n+1)X(k+1) 0..2 arrays with nondecreasing x(i,j)-x(i,j-1) in the i direction and nondecreasing absolute value of x(i,j)-x(i-1,j) in the j direction. A250898

a(n) is the smallest number k >= 2 for which k and k² contain the same digits in the same proportion in base n. A61664

Number of (n+1) X (6+1) 0..2 arrays with nondecreasing x(i,j)-x(i,j-1) in the i direction and nondecreasing absolute value of x(i,j)-x(i-1,j) in the j direction. A250896

Number of (2+1) X (n+1) 0..2 arrays with nondecreasing x(i,j)-x(i,j-1) in the i direction and nondecreasing absolute value of x(i,j)-x(i-1,j) in the j direction. A250900

Even-indexed primes: a(n) = prime(2n). A31215

After 1, composite odd numbers, whose prime divisors, when multiplied together without carry-bits (as codes for GF(2)[X]-polynomials, with A048720), yield the same number back. A235040