Properties of the Number 9121

Nine Thousand One Hundred Twenty-One

Basics

Value: 9120 → 9121 → 9122

Parity: odd

Prime: No

Previous Prime: 9109

Next Prime: 9127

Digit Sum: 13

Digital Root: 4

Palindrome: No

Factorization: 7 × 1303

Divisors: 1, 7, 1303, 9121

Polygonal

Triangular: No

Square: No

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: No

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Representations

Binary: 10001110100001

Octal: 21641

Duodecimal: 5341

Hexadecimal: 23a1

Square: 83192641

Square Root: 95.50392662084633

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

Euler transform of negative integers. A73592

Numbers that are the sum of 11 positive 8th powers. A3389

Number of distinct quadratic residues mod 10ⁿ; also number of distinct n-digit endings of base-10 squares. A993

Concentric 24-gonal numbers. A195158

The number of non-equivalent distinguishing colorings of the cycle on n vertices with at most k colors (k>=1). The cycle graph is defined for n>=3; extended to n=1,2 using the closed form. Square array read by descending antidiagonals: the rows are indexed by n, the number of vertices of the cycle and the columns are indexed by k, the number of permissible colors. A309528

a(n) = 9·n² - 3·n + 1 with n>0. A304163

a(n) = n³ - 7·n + 7. A106734

a(n) = 10·n² + 4·n + 1. A272039

Numerator of the barycenter of first n primes defined as a(n) = numerator(∑_i=1..n (i·prime(i)) / ∑_i=1..n prime(i)). A306834

Indices k such that A377091(k) is immediately followed by A377091(k+1) = -A377091(k). A379802