Properties of the Number -31985

Thirty-One Thousand Nine Hundred Eighty-Five

Basics

Value: -31986 → -31985 → -31984

Parity: odd

Prime: No

Previous Prime:

Next Prime: 1

Digit Sum: 26

Digital Root: 8

Palindrome: No

Factorization: 5 × 6397

Divisors: 1, 5, 6397, 31985

Polygonal

Triangular: No

Square: No

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: No

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Representations

Binary: -111110011110001

Octal: -76361

Duodecimal: -16615

Hexadecimal: -7cf1

Square: 1023040225

Square Root: 178.84350701101786

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

T(n,k)=Number of nXk 0..1 arrays with each 1 horizontally or vertically adjacent to 0, 1, 2 or 4 1s. A295716

Number of primes of the form P(k) = k² + k + 41 for k <= 10ⁿ, where P(k) is Euler's prime-generating polynomial A202018. A331876

Number of subsets of {1, ..., n} that are double-free or sum-free. A88813

Number of prime numbers of the form k² + k + 41 below 10ⁿ. A319906

Number of runs of 0's of odd length in all ternary words of length n. A119916

a(n) = ∑_{k = 1..10ⁿ} number of primes (counted with multiplicity) dividing k (A001222). A71811

Number of nX4 0..1 arrays with each 1 horizontally or vertically adjacent to 0, 1, 2 or 4 1s. A295712

Number of n X n 0..1 arrays with each 1 horizontally or vertically adjacent to 0, 1, 2 or 4 1's. A295710