18113013 has 12 divisors (see below), whose sum is σ = 26458380. Its totient is φ = 11939136.

The previous prime is 18113009. The next prime is 18113027. The reversal of 18113013 is 31031181.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 5560164 + 12552849 = 2358^2 + 3543^2 .

It is not a de Polignac number, because 18113013 - 2² = 18113009 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18113033) 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, 10506 + ... + 12107.

It is an arithmetic number, because the mean of its divisors is an integer number (2204865).

Almost surely, 2^18113013 is an apocalyptic number.

It is an amenable number.

18113013 is a deficient number, since it is larger than the sum of its proper divisors (8345367).

18113013 is a wasteful number, since it uses less digits than its factorization.

18113013 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22708 (or 22705 counting only the distinct ones).

The product of its (nonzero) digits is 72, while the sum is 18.

The square root of 18113013 is about 4255.9385568873. The cubic root of 18113013 is about 262.6214730308.

Adding to 18113013 its reverse (31031181), we get a palindrome (49144194).

The spelling of 18113013 in words is "eighteen million, one hundred thirteen thousand, thirteen".