Properties of the Number 42491

Forty-Two Thousand Four Hundred Ninety-One

Basics

Value: 42490 → 42491 → 42492

Parity: odd

Prime: Yes

Previous Prime: 42487

Next Prime: 42499

Digit Sum: 20

Digital Root: 2

Palindrome: No

Factorization: 42491

Divisors: 1, 42491

Polygonal

Triangular: No

Square: No

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: No

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Representations

Binary: 1010010111111011

Octal: 122773

Duodecimal: 2070B

Hexadecimal: a5fb

Square: 1805485081

Square Root: 206.13345191889647

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

Primes p whose period of reciprocal equals (p-1)/7. A56212

Primes of the form (5+ a triangular number A000217). A159049

Primes p which are floor of Root-mean-cube (RMC) of prime(n), prime(n+1) and prime(n+2). A239941

Primes which are the sum of 6 consecutive triangular numbers A000217. A159071

Primes of the form 2·3^a+5^b where 3^a+2·5^b is also prime, and a,b >= 1. A344175

Number of ways to place zero or more nonadjacent 1,1 2,1 2,2 3,0 3,1 3,2 3,3 4,1 polyhexes in any orientation on a planar nXnXn triangular grid. A155355

Denominators of continued fraction convergents to sqrt(773). A42491

Continued fraction expansion of a constant r such that the odd-indexed bisection equals the continued fraction of 2·r, with an even-indexed bisection of all 2's. A322728