13318531 has 16 divisors (see below), whose sum is σ = 14653440. Its totient is φ = 12055680.

The previous prime is 13318507. The next prime is 13318549. The reversal of 13318531 is 13581331.

13318531 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a cyclic number.

It is not a de Polignac number, because 13318531 - 2¹⁷ = 13187459 is a prime.

It is a super-2 number, since 2×13318531² = 354766535995922, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 13318496 and 13318505.

It is not an unprimeable number, because it can be changed into a prime (13318231) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 63016 + ... + 63226.

It is an arithmetic number, because the mean of its divisors is an integer number (915840).

Almost surely, 2^13318531 is an apocalyptic number.

13318531 is a deficient number, since it is larger than the sum of its proper divisors (1334909).

13318531 is a wasteful number, since it uses less digits than its factorization.

13318531 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 354.

The product of its digits is 1080, while the sum is 25.

The square root of 13318531 is about 3649.4562608696. The cubic root of 13318531 is about 237.0384372726.

Adding to 13318531 its reverse (13581331), we get a palindrome (26899862).

The spelling of 13318531 in words is "thirteen million, three hundred eighteen thousand, five hundred thirty-one".