18065631 has 4 divisors (see below), whose sum is σ = 24087512. Its totient is φ = 12043752.

The previous prime is 18065627. The next prime is 18065651. The reversal of 18065631 is 13656081.

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

It is not a de Polignac number, because 18065631 - 2² = 18065627 is a prime.

It is a super-2 number, since 2×18065631² = 652734046856322, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18065651) 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, 3010936 + ... + 3010941.

It is an arithmetic number, because the mean of its divisors is an integer number (6021878).

Almost surely, 2^18065631 is an apocalyptic number.

18065631 is a deficient number, since it is larger than the sum of its proper divisors (6021881).

18065631 is an equidigital number, since it uses as much as digits as its factorization.

18065631 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6021880.

The product of its (nonzero) digits is 4320, while the sum is 30.

The square root of 18065631 is about 4250.3683369797. The cubic root of 18065631 is about 262.3922750722.

The spelling of 18065631 in words is "eighteen million, sixty-five thousand, six hundred thirty-one".