18013113 has 12 divisors (see below), whose sum is σ = 26460720. Its totient is φ = 11804856.

The previous prime is 18013111. The next prime is 18013123. The reversal of 18013113 is 31131081.

It is a happy number.

It is not a de Polignac number, because 18013113 - 2¹ = 18013111 is a prime.

It is not an unprimeable number, because it can be changed into a prime (18013111) 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, 16431 + ... + 17492.

It is an arithmetic number, because the mean of its divisors is an integer number (2205060).

Almost surely, 2^18013113 is an apocalyptic number.

It is an amenable number.

18013113 is a deficient number, since it is larger than the sum of its proper divisors (8447607).

18013113 is a wasteful number, since it uses less digits than its factorization.

18013113 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 33988 (or 33985 counting only the distinct ones).

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

The square root of 18013113 is about 4244.1857876394. The cubic root of 18013113 is about 262.1377643100.

Adding to 18013113 its reverse (31131081), we get a palindrome (49144194).

The spelling of 18013113 in words is "eighteen million, thirteen thousand, one hundred thirteen".