Properties of the Number 31894

Thirty-One Thousand Eight Hundred Ninety-Four

Basics

Value: 31893 → 31894 → 31895

Parity: even

Prime: No

Previous Prime: 31891

Next Prime: 31907

Digit Sum: 25

Digital Root: 7

Palindrome: No

Factorization: 2 × 37 × 431

Divisors: 1, 2, 37, 74, 431, 862, 15947, 31894

Polygonal

Triangular: No

Square: No

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: No

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Representations

Binary: 111110010010110

Octal: 76226

Duodecimal: 1655A

Hexadecimal: 7c96

Square: 1017227236

Square Root: 178.58891342969753

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

Numbers n such that φ(reverse(n)) = σ(n). A70835

a(n) = smallest number m which can be obtained in n ways by subtracting twice a triangular number from a perfect square. A78714

π function of the primes given in A183194. A183195

a(n) is the dot product of the vectors of the first n primes and the next n primes. A337574

Number of binary strings of length n with equal numbers of 0011 and 0101 substrings. A164174

Number of -2..2 arrays x(i) of n+1 elements i=1..n+1 with x(i)+x(j), x(i+1)+x(j+1), -(x(i)+x(j+1)), and -(x(i+1)+x(j)) having three distinct values for every i<=n and j<=n. A211459

G.f.: A(x) = ∑_n>=1 a(n)*xⁿ = x*∏_n>=1 (1 + a(n)*xⁿ)/(1 - a(n)*xⁿ). A299021

Lucky numbers with size of gaps equal to 12 (lower terms). A31894

Least k such that σ(k·n) = σ(k·n-1), or 0 if no such k exists. A275411