Properties of the Number 42569

Forty-Two Thousand Five Hundred Sixty-Nine

Basics

Value: 42568 → 42569 → 42570

Parity: odd

Prime: Yes

Previous Prime: 42557

Next Prime: 42571

Digit Sum: 26

Digital Root: 8

Palindrome: No

Factorization: 42569

Divisors: 1, 42569

Polygonal

Triangular: No

Square: No

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: No

Today's Target

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Representations

Binary: 1010011001001001

Octal: 123111

Duodecimal: 20775

Hexadecimal: a649

Square: 1812119761

Square Root: 206.3225629929989

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

List of primes p1 such that (p1,p2) are twin primes where both 2·p1+p2 and p1+2·p2 are primes. A174920

a(n) = n*(n² - 1)/2 - 1. A117560

First term of weak prime sextet: p(m+1)-p(m) < p(m+2)-p(m+1) < p(m+3)-p(m+2) < p(m+4)-p(m+3) < p(m+5)-p(m+4). A54828

Primes p such that 14·p + 1 divides 2^p - 1. A350702

Primes p such that 3·p+4, 5·p+6 and 7·p+8 are also prime. A173879

Primes p such that 4·p+3, 6·p+5 and 8·p+7 are all primes. A329551

Numbers n such that xⁿ + x⁵ + x⁴ + x³ + x² + x + 1 is irreducible over GF(2). A57484

Number of walks within N³ (the first octant of Z³) starting at (0,0,0) and consisting of n steps taken from {(-1, -1, -1), (-1, 0, 0), (0, 1, 1), (1, -1, 1), (1, 1, -1)}. A149022

Positions of records in A196047. A390293

Denominators of continued fraction convergents to sqrt(813). A42569