Properties of the Number 61381

Sixty-One Thousand Three Hundred Eighty-One

Basics

Value: 61380 → 61381 → 61382

Parity: odd

Prime: Yes

Previous Prime: 61379

Next Prime: 61403

Digit Sum: 19

Digital Root: 1

Palindrome: No

Factorization: 61381

Divisors: 1, 61381

Polygonal

Triangular: No

Square: No

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: No

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Representations

Binary: 1110111111000101

Octal: 167705

Duodecimal: 2B631

Hexadecimal: efc5

Square: 3767627161

Square Root: 247.7518920210298

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

First member of a prime quadruple in a 2p-1 progression. A57327

Smallest primes starting a complete three iterations Cunningham chain of the second kind. A110024

Noncomposite numbers in the northern ray of the Ulam spiral as oriented on the March 1964 cover of Scientific American. A168023

Indices of 10-gonal numbers (A001107) that are also centered 10-gonal numbers (A062786). A280070

Number of hypoplactic classes of 5-parking functions of length n. A243677

Smallest "inconsummate number" in base n greater than in the previous base. A61381