Properties of the Number 7561

Seven Thousand Five Hundred Sixty-One

Basics

Value: 7560 → 7561 → 7562

Parity: odd

Prime: Yes

Previous Prime: 7559

Next Prime: 7573

Digit Sum: 19

Digital Root: 1

Palindrome: No

Factorization: 7561

Divisors: 1, 7561

Polygonal

Triangular: No

Square: No

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: No

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Representations

Binary: 1110110001001

Octal: 16611

Duodecimal: 4461

Hexadecimal: 1d89

Square: 57168721

Square Root: 86.95401083331349

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

Centered 12-gonal numbers, or centered dodecagonal numbers: numbers of the form 6·k*(k-1) + 1. A3154

Markoff (or Markov) numbers: union of positive integers x, y, z satisfying x² + y² + z² = 3·x*y·z. A2559

First member of a prime triple in a 2p-1 progression. A57326

Number of reducible integer partitions of n. A305563

Primes of the form 210n + 1. A73102

Primes p=prime(k) of level (1,2), i.e., such that A118534(k) = prime(k-2). A117876

Centered 20-gonal (or icosagonal) numbers. A69133

Small-number statistic from the enumeration of domino tilings of a 3-pillow of order n. A112835

Primes of the form 2·n²+6·n+1. A176549

Concentric 18-gonal numbers. A195147