18214631 has 2 divisors, whose sum is σ = 18214632. Its totient is φ = 18214630.

The previous prime is 18214621. The next prime is 18214727. The reversal of 18214631 is 13641281.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 18214631 - 2¹⁴ = 18198247 is a prime.

It is a super-2 number, since 2×18214631² = 663545564932322, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 18214631.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (18214601) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9107315 + 9107316.

It is an arithmetic number, because the mean of its divisors is an integer number (9107316).

Almost surely, 2^18214631 is an apocalyptic number.

18214631 is a deficient number, since it is larger than the sum of its proper divisors (1).

18214631 is an equidigital number, since it uses as much as digits as its factorization.

18214631 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1152, while the sum is 26.

The square root of 18214631 is about 4267.8602366994. The cubic root of 18214631 is about 263.1116789219. Note that the first 3 decimals are identical.

The spelling of 18214631 in words is "eighteen million, two hundred fourteen thousand, six hundred thirty-one".