18113431 has 8 divisors (see below), whose sum is σ = 21206304. Its totient is φ = 15146880.

The previous prime is 18113423. The next prime is 18113437. The reversal of 18113431 is 13431181.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 18113431 - 2³ = 18113423 is a prime.

It is a super-2 number, since 2×18113431² = 656192765183522, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18113437) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 31270 + ... + 31843.

It is an arithmetic number, because the mean of its divisors is an integer number (2650788).

Almost surely, 2^18113431 is an apocalyptic number.

18113431 is a deficient number, since it is larger than the sum of its proper divisors (3092873).

18113431 is an equidigital number, since it uses as much as digits as its factorization.

18113431 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 63161.

The product of its digits is 288, while the sum is 22.

The square root of 18113431 is about 4255.9876644558. The cubic root of 18113431 is about 262.6234932162.

The spelling of 18113431 in words is "eighteen million, one hundred thirteen thousand, four hundred thirty-one".