18450631 has 2 divisors, whose sum is σ = 18450632. Its totient is φ = 18450630.

The previous prime is 18450629. The next prime is 18450637. The reversal of 18450631 is 13605481.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 18450631 - 2¹ = 18450629 is a prime.

It is a super-2 number, since 2×18450631² = 680851568596322, which contains 22 as substring.

Together with 18450629, it forms a pair of twin primes.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 18450631.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (18450637) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9225315 + 9225316.

It is an arithmetic number, because the mean of its divisors is an integer number (9225316).

Almost surely, 2^18450631 is an apocalyptic number.

18450631 is a deficient number, since it is larger than the sum of its proper divisors (1).

18450631 is an equidigital number, since it uses as much as digits as its factorization.

18450631 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2880, while the sum is 28.

The square root of 18450631 is about 4295.4197699410. The cubic root of 18450631 is about 264.2431519757.

The spelling of 18450631 in words is "eighteen million, four hundred fifty thousand, six hundred thirty-one".