Properties of the Number 1161

One Thousand One Hundred Sixty-One

Basics

Value: 1160 → 1161 → 1162

Parity: odd

Prime: No

Previous Prime: 1153

Next Prime: 1163

Digit Sum: 9

Digital Root: 9

Palindrome: No

Factorization: 3 ³ × 43

Divisors: 1, 3, 9, 27, 43, 129, 387, 1161

Polygonal

Triangular: No

Square: No

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: No

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Representations

Binary: 10010001001

Octal: 2211

Duodecimal: 809

Hexadecimal: 489

Square: 1347921

Square Root: 34.07345007480164

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

Sum of the first n primes. A7504

Number of degree-n irreducible polynomials over GF(2); number of n-bead necklaces with beads of 2 colors when turning over is not allowed and with primitive period n; number of binary Lyndon words of length n. A1037

a(n) = (1/n) * ∑_{d divides n} μ(n/d) * (2^d - 1). A59966

First spoke of a hexagonal spiral. A56105

Number of ways to split {1, 2, 3, ..., 3n} into n arithmetic progressions each with 3 terms. A104429

a(n) = (3·n² - n - 2)/2. A115067

In the '3x+1' problem, these values for the starting value set new records for number of steps to reach 1. A6877

Generalized 28-gonal (or icosioctagonal) numbers: m*(13·m - 12) with m = 0, +1, -1, +2, -2, +3, -3, ... A303812

a(n) = floor(n*φ⁷), where φ is the golden ratio, A001622. A4922

Sum of first n semiprimes. A62198