Properties of the Number 12231

Twelve Thousand Two Hundred Thirty-One

Basics

Value: 12230 → 12231 → 12232

Parity: odd

Prime: No

Previous Prime: 12227

Next Prime: 12239

Digit Sum: 9

Digital Root: 9

Palindrome: No

Factorization: 3 ⁴ × 151

Divisors: 1, 3, 9, 27, 81, 151, 453, 1359, 4077, 12231

Polygonal

Triangular: No

Square: No

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: No

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Representations

Binary: 10111111000111

Octal: 27707

Duodecimal: 70B3

Hexadecimal: 2fc7

Square: 149597361

Square Root: 110.59385154700057

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

Egyptian fractions: number of solutions of 1 = 1/x₁ + ... + 1/x_n in positive integers. A2967

Triangle T(n, k) = Numbers of ways to place k points on a triangular grid of side n so that no two of them are adjacent. Triangle read by rows. A239567

Number of integer partitions of n whose distinct parts have integer median. A360686

Number of partitions p = [x(1), ..., x(k)], where x(1) >= x(2) >= ... >= x(k), of n such that max(x(i) - x(i-1)) > number of parts of p. A241832

a(2·n) = 10·a(n), a(2·n+1) = a(n) + a(n+1). A178569

Numbers of rank 10 in the poset of lunar numbers. A191752

Number of ways to place 6 points on a triangular grid of side n so that no two of them are adjacent. A282998

Numbers k with exactly two distinct prime factors and such that φ(k) is a square, when: k = p^2s * q^2t+1 with s >= 1, t >= 0, p <> q primes. A324747

a(n) is the number of edges formed by n-secting the angles of a nonagon (enneagon). A335783

Triangle read by rows: T(n,k) = number of sequences of n positive integers with reciprocals adding up to k (k=1,2,...,n). A280519