Properties of the Number 7957

Seven Thousand Nine Hundred Fifty-Seven

Basics

Value: 7956 → 7957 → 7958

Parity: odd

Prime: No

Previous Prime: 7951

Next Prime: 7963

Digit Sum: 28

Digital Root: 1

Palindrome: No

Factorization: 73 × 109

Divisors: 1, 73, 109, 7957

Polygonal

Triangular: No

Square: No

Pentagonal: Yes

Hexagonal: No

Heptagonal: No

Tetrahedral: No

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Representations

Binary: 1111100010101

Octal: 17425

Duodecimal: 4731

Hexadecimal: 1f15

Square: 63313849

Square Root: 89.20201791439474

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

Fermat pseudoprimes to base 2, also called Sarrus numbers or Poulet numbers. A1567

Pentagonal numbers with odd index: a(n) = (2·n+1)*(3·n+1). A33570

Super-Poulet numbers: Poulet numbers whose divisors d all satisfy d∣2^d-2. A50217

Fermat pseudoprimes to base 4. A20136

Fermat pseudoprimes to base 2 with two prime factors. A214305

Numerators of coefficients for central differences M₄^2·n. A2675

Semiprimes in A003215. A113530

Sarrus numbers A001567 that are not Carmichael numbers A002997. A153508

Semiprimes of the form n*(3·n-1)/2. A245365

Numbers k such that φ(k) is a perfect 5th power. A78165