Properties of the Number 61991

Sixty-One Thousand Nine Hundred Ninety-One

Basics

Value: 61990 → 61991 → 61992

Parity: odd

Prime: Yes

Previous Prime: 61987

Next Prime: 62003

Digit Sum: 26

Digital Root: 8

Palindrome: No

Factorization: 61991

Divisors: 1, 61991

Polygonal

Triangular: No

Square: No

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: No

Today's Target

2196 Try Today's Challenge

Representations

Binary: 1111001000100111

Octal: 171047

Duodecimal: 2BA5B

Hexadecimal: f227

Square: 3842884081

Square Root: 248.97991886897225

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 (68·10^k + 7)/3 is prime. A270613

The first of three consecutive primes the sum of which is equal to the sum of three consecutive squares. A298223

Primes that remain prime through 4 iterations of the function f(x) = 9x + 8. A23326

Primes of the form n² - 10. A201313

Primes of the form p² + q² + 21, where p and q are consecutive primes. A229075

Number of ways to place 5 nonattacking queens on a 5 X n board. A61991