18010631 has 2 divisors, whose sum is σ = 18010632. Its totient is φ = 18010630.

The previous prime is 18010627. The next prime is 18010637. The reversal of 18010631 is 13601081.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 18010631 - 2² = 18010627 is a prime.

It is a super-2 number, since 2×18010631² = 648765658036322, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (18010637) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9005315 + 9005316.

It is an arithmetic number, because the mean of its divisors is an integer number (9005316).

Almost surely, 2^18010631 is an apocalyptic number.

18010631 is a deficient number, since it is larger than the sum of its proper divisors (1).

18010631 is an equidigital number, since it uses as much as digits as its factorization.

18010631 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 144, while the sum is 20.

The square root of 18010631 is about 4243.8933775485. The cubic root of 18010631 is about 262.1257238997.

The spelling of 18010631 in words is "eighteen million, ten thousand, six hundred thirty-one".