Properties of the Number 71631

Seventy-One Thousand Six Hundred Thirty-One

Basics

Value: 71630 → 71631 → 71632

Parity: odd

Prime: No

Previous Prime: 71597

Next Prime: 71633

Digit Sum: 18

Digital Root: 9

Palindrome: No

Factorization: 3 ³ × 7 × 379

Divisors: 1, 3, 7, 9, 21, 27, 63, 189, 379, 1137

Polygonal

Triangular: Yes

Square: No

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: No

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Representations

Binary: 10001011111001111

Octal: 213717

Duodecimal: 35553

Hexadecimal: 117cf

Square: 5131000161

Square Root: 267.6396831562913

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

Doubly triangular numbers: a(n) = n*(n+1)*(n²+n+2)/8. A2817

Crystal ball sequence for A₄ lattice. A8384

a(n) = A108625(n, 3·n). A363870

"Primitive" numbers k such that k divides 4^k - 1. A323203

Triangular numbers that are repdigits with length > 2 in some base. A274084

Triangular numbers t(n) such that n / (product of decimal digits of t(n)) is an integer. A307792

E.g.f. A(x) satisfies: A(x) = 2·x / (exp(A(x)) * (2 + A(x))). A334262

Integer part of the area of circles with prime radii. A97427

Number of terms in the set InvPhi(16·prime(n)), where prime(n) is the n-th prime. A71631