18063431 has 4 divisors (see below), whose sum is σ = 18090264. Its totient is φ = 18036600.

The previous prime is 18063413. The next prime is 18063439. The reversal of 18063431 is 13436081.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-18063431 is a prime.

It is a super-2 number, since 2×18063431² = 652575078983522, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 18063431.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18063439) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 12380 + ... + 13761.

It is an arithmetic number, because the mean of its divisors is an integer number (4522566).

Almost surely, 2^18063431 is an apocalyptic number.

18063431 is a deficient number, since it is larger than the sum of its proper divisors (26833).

18063431 is an equidigital number, since it uses as much as digits as its factorization.

18063431 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 26832.

The product of its (nonzero) digits is 1728, while the sum is 26.

The square root of 18063431 is about 4250.1095280004. The cubic root of 18063431 is about 262.3816234203.

The spelling of 18063431 in words is "eighteen million, sixty-three thousand, four hundred thirty-one".