Properties of the Number 8121

Eight Thousand One Hundred Twenty-One

Basics

Value: 8120 → 8121 → 8122

Parity: odd

Prime: No

Previous Prime: 8117

Next Prime: 8123

Digit Sum: 12

Digital Root: 3

Palindrome: No

Factorization: 3 × 2707

Divisors: 1, 3, 2707, 8121

Polygonal

Triangular: No

Square: No

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: No

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Representations

Binary: 1111110111001

Octal: 17671

Duodecimal: 4849

Hexadecimal: 1fb9

Square: 65950641

Square Root: 90.11659114724658

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

Centered 20-gonal (or icosagonal) numbers. A69133

Triangle, read by rows, such that T(n,k) = T(n-1,k-1) + [T²](n-2,k-1) with T(n,0) = T(n,n) = 1 for n>=0, k>=0. A113983

Number of ordered triples of integers from [ 1..n ] with no global factor. A15631

Numbers k such that the k-th run-length A110969(k) of the sequence of non-prime-powers (A024619) is different from all prior run-lengths. A373670

Fundamental discriminants of real quadratic number fields with class number 5. A94614

a(n)³ is smallest cube containing exactly n 5's. A48370

Geometric mean of the digits = 2. In other words, the product of the digits is = 2^k where k is the number of digits. A61426

Partial sums of sequence (essentially A002378): 1, 2, 6, 12, 20, 30, 42, 56, 72, 90, ... A64999

Numbers n such that the decimal number concat(6,n) is a square. A273361

Greatest n-bit number whose binary representation's substrings represent the maximal number (A112509(n)) of distinct integers. A112511