Properties of the Number 31898

Thirty-One Thousand Eight Hundred Ninety-Eight

Basics

Value: 31897 → 31898 → 31899

Parity: even

Prime: No

Previous Prime: 31891

Next Prime: 31907

Digit Sum: 29

Digital Root: 2

Palindrome: No

Factorization: 2 × 41 × 389

Divisors: 1, 2, 41, 82, 389, 778, 15949, 31898

Polygonal

Triangular: No

Square: No

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: No

Today's Target

2196 Try Today's Challenge

Representations

Binary: 111110010011010

Octal: 76232

Duodecimal: 16562

Hexadecimal: 7c9a

Square: 1017482404

Square Root: 178.60011198204776

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 no 1 equal to more than three of its horizontal, diagonal and antidiagonal neighbors, with the exception of exactly two elements. A284075

a(n) = 25·n² - 14·n + 2. A154357

Row sums of Sheffer triangle S2[3,2] given by A225466. A284864

First of triples of consecutive happy numbers, i.e., the first of three consecutive integers each of which is a happy number (A007770). A72494

Numbers k that divide A039916(k). A65965

Triangular array read by rows: row n shows the coefficients of the polynomial u(n) = c(0) + c(1)*x + ... + c(n)*xⁿ which is the denominator of the n-th convergent of the continued fraction [k, k, k, ... ], where k = (x + 1)/(x + 2). A231775

Number of nX6 0..1 arrays with no 1 equal to more than three of its horizontal, diagonal and antidiagonal neighbors, with the exception of exactly two elements. A284073

Number of 3Xn 0..1 arrays with no 1 equal to more than three of its horizontal, diagonal and antidiagonal neighbors, with the exception of exactly two elements. A284077

Beach-Williams Pell numbers of type 2pq (p,q primes). A212075

Lucky numbers with size of gaps equal to 16 (lower terms). A31898