Properties of the Number 7961

Seven Thousand Nine Hundred Sixty-One

Basics

Value: 7960 → 7961 → 7962

Parity: odd

Prime: No

Previous Prime: 7951

Next Prime: 7963

Digit Sum: 23

Digital Root: 5

Palindrome: No

Factorization: 19 × 419

Divisors: 1, 19, 419, 7961

Polygonal

Triangular: No

Square: No

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: No

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Representations

Binary: 1111100011001

Octal: 17431

Duodecimal: 4735

Hexadecimal: 1f19

Square: 63377521

Square Root: 89.22443611477743

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

Composite numbers whose divisors (except 1) all contain the digit 9. A62680

a(n) = n*(11·n+1)/2. A22269

Number of odd enriched p-trees of weight n (all outdegrees are odd). A300439

Numbers k such that the decimal number concat(4,k) is a square. A273359

a(n) = (n - 1)*(n² + n - 1). A33445

Expansion of 1/∏_k>=1 (1 - x^k)^{valuation(k,4} + 1). A373295

a(n) = 5·n² - n + 1. A172043

Smallest j such that j·2*p(n)³-1=q is prime, j·2*p(n)*q²-1=r, j·2*p(n)*r²-1=s, where r and s are also prime. A224611

Number of active (ON, black) cells in n-th stage of growth of two-dimensional cellular automaton defined by "Rule 145", based on the 5-celled von Neumann neighborhood. A270286

a(0)=1; a(n) = sum of all previous terms, eliminating repeated digits (starting from the left). A370748