Properties of the Number 30991

Thirty Thousand Nine Hundred Ninety-One

Basics

Value: 30990 → 30991 → 30992

Parity: odd

Prime: No

Previous Prime: 30983

Next Prime: 31013

Digit Sum: 22

Digital Root: 4

Palindrome: No

Factorization: 17 × 1823

Divisors: 1, 17, 1823, 30991

Polygonal

Triangular: No

Square: No

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: No

Today's Target

2196 Try Today's Challenge

Representations

Binary: 111100100001111

Octal: 74417

Duodecimal: 15B27

Hexadecimal: 790f

Square: 960442081

Square Root: 176.042608478743

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

Numbers k such that k, k+2, k+4, k+6, k+8, k+10 are semiprimes. A92128

T(n,k)=Number of length n+3 0..k arrays with no four elements in a row with pattern abba (with a≠b) and new values 0..k introduced in 0..k order. A243389

Numerators of the convergents given by treating A391217 as continued fraction coefficients after the leading 0. A392258

Numbers which do not reach zero under either of the iterations: x -> floor(sqrt(x)) * (x - floor(sqrt(x))²) or y -> ceiling(sqrt(y)) * (ceiling(sqrt(y))² - y). A219963

Number of length n+3 0..3 arrays with no four elements in a row with pattern abba (with a≠b) and new values 0..3 introduced in 0..3 order. A243384

Numbers n such that A277118(n) = 17. A277119

7-automorphic numbers ending in 5: final digits of 7n² agree with n. A30991

Number of nX4 0..1 arrays with every element unequal to 2, 3, 5 or 7 king-move adjacent elements, with upper left element zero. A304259