13117918 has 24 divisors (see below), whose sum is σ = 22262760. Its totient is φ = 5748960.

The previous prime is 13117891. The next prime is 13117919. The reversal of 13117918 is 81971131.

13117918 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a hoax number, since the sum of its digits (31) coincides with the sum of the digits of its distinct prime factors.

It is a self number, because there is not a number n which added to its sum of digits gives 13117918.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (13117919) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 18148 + ... + 18856.

It is an arithmetic number, because the mean of its divisors is an integer number (927615).

Almost surely, 2^13117918 is an apocalyptic number.

13117918 is a deficient number, since it is larger than the sum of its proper divisors (9144842).

13117918 is a wasteful number, since it uses less digits than its factorization.

13117918 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 780 (or 751 counting only the distinct ones).

The product of its digits is 1512, while the sum is 31.

The square root of 13117918 is about 3621.8666458057. The cubic root of 13117918 is about 235.8422650859.

It can be divided in two parts, 1311 and 7918, that added together give a palindrome (9229).

The spelling of 13117918 in words is "thirteen million, one hundred seventeen thousand, nine hundred eighteen".