Properties of the Number 31119

Thirty-One Thousand One Hundred Nineteen

Basics

Value: 31118 → 31119 → 31120

Parity: odd

Prime: No

Previous Prime: 31091

Next Prime: 31121

Digit Sum: 15

Digital Root: 6

Palindrome: No

Factorization: 3 × 11 × 23 × 41

Divisors: 1, 3, 11, 23, 33, 41, 69, 123, 253, 451

Polygonal

Triangular: No

Square: No

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: No

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Representations

Binary: 111100110001111

Octal: 74617

Duodecimal: 16013

Hexadecimal: 798f

Square: 968392161

Square Root: 176.40578221815747

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

Triangle, read by rows, T(n, k) = binomial(n, k) for n < 2 and binomial(n, k) + n^n-1 * binomial(n-2, k-1) otherwise. A146990

a(n) = ∑_k=1..n (k²*floor(k/2)). A285188

G.f.: Re(1/(1 + i·x/(1 + i·x²/(1 + i·x³/(1 + i·x⁴/(1 + i·x⁵/(1 + ...))))))), a continued fraction, where i is the imaginary unit. A293268

Least m such that reverse(σ(m)) = σ(m+n). A71813

Replace in n each nonzero digit d with prime(d). A329147

Indices of primes in sequence defined by A(0) = 39, A(n) = 10·A(n-1) - 71 for n > 0. A101827

Numbers n such that 3·10ⁿ + R_n + 8 is prime, where R_n = 11...1 is the repunit (A002275) of length n. A102965

a(1) = 2, a(2) = 3; a(n) is the smallest prime not included earlier such that concatenation of three successive terms is a prime. A350853

Position of n-th 7 in A031111. A31119