Properties of the Number 6987

Six Thousand Nine Hundred Eighty-Seven

Basics

Value: 6986 → 6987 → 6988

Parity: odd

Prime: No

Previous Prime: 6983

Next Prime: 6991

Digit Sum: 30

Digital Root: 3

Palindrome: No

Factorization: 3 × 17 × 137

Divisors: 1, 3, 17, 51, 137, 411, 2329, 6987

Polygonal

Triangular: No

Square: No

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: No

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Representations

Binary: 1101101001011

Octal: 15513

Duodecimal: 4063

Hexadecimal: 1b4b

Square: 48818169

Square Root: 83.58827668997608

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

Number of decimal digits in n-th Mersenne prime. A28335

Inverse Mertens function: smallest k such that |M(k)| = n, where M(x) is Mertens's function A002321. A51402

Smallest value of·such that M(x) = -n, where M(x) is Mertens's function A002321. A51401

Powers of sqrt(5) rounded down. A17919

a(n) = n*(n+1)*(8·n + 1)/6. A132124

Odd interprimes divisible by 17. A124620

Number of ways to place 3 nonattacking wazirs on a 3 X n board. A172229

Integer part of square root of n¹¹ = A008455(n). A155015

Expansion of ∏_k>=1 1/((1-x^3·k-1)*(1-x^3·k-2))^k. A262883

Triangle read by rows: T(n,k) = number of parity alternating partitions of [n] into k blocks (1 <= k <= m). A274310