18241631 has 2 divisors, whose sum is σ = 18241632. Its totient is φ = 18241630.

The previous prime is 18241627. The next prime is 18241637. The reversal of 18241631 is 13614281.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 18241631 - 2² = 18241627 is a prime.

It is a super-2 number, since 2×18241631² = 665514203080322, which contains 22 as substring.

It is a Sophie Germain prime.

It is a Chen prime.

It is equal to p_1165760 and since 18241631 and 1165760 have the same sum of digits, it is a Honaker prime.

It is a self number, because there is not a number n which added to its sum of digits gives 18241631.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (18241637) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9120815 + 9120816.

It is an arithmetic number, because the mean of its divisors is an integer number (9120816).

Almost surely, 2^18241631 is an apocalyptic number.

18241631 is a deficient number, since it is larger than the sum of its proper divisors (1).

18241631 is an equidigital number, since it uses as much as digits as its factorization.

18241631 is an odious number, because the sum of its binary digits is odd.

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

The square root of 18241631 is about 4271.0222429765. The cubic root of 18241631 is about 263.2416203971.

The spelling of 18241631 in words is "eighteen million, two hundred forty-one thousand, six hundred thirty-one".