Properties of the Number -7681

Six Hundred Eighty-One

Basics

Value: -7682 → -7681 → -7680

Parity: odd

Prime: No

Previous Prime:

Next Prime: 1

Digit Sum: 22

Digital Root: 4

Palindrome: No

Factorization: 7681

Divisors: 1, 7681

Polygonal

Triangular: No

Square: No

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: No

Today's Target

5184 Try Today's Challenge

Representations

Binary: -1111000000001

Octal: -17001

Duodecimal: -4541

Hexadecimal: -1e01

Square: 58997761

Square Root: 87.64131445842195

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

Proth primes: primes of the form k·2^m + 1 with odd k < 2^m, m >= 1. A80076

Primes of the form 1024n + 513. A105132

Primes of form n² + 625. A256777

Number T(n,k) of entries in the k-th blocks of all set partitions of [n] when blocks are ordered by increasing lengths (and increasing smallest elements); triangle T(n,k), n>=1, 1<=k<=n, read by rows. A319298

Primes of the form 9x² + 6xy + 1849y². A244019

Smallest prime of form 2ⁿ*k + 1. A35089

a(n) = 15·2ⁿ⁺¹ + 1. A195744

a(n) is the least prime p such that p-1 is divisible by 2ⁿ and not by 2ⁿ⁺¹. A57775

Numbers whose least quadratic nonresidue (A020649) is 13. A25025

Primes of the form 512·k+1. A76339