12018631 has 2 divisors, whose sum is σ = 12018632. Its totient is φ = 12018630.

The previous prime is 12018623. The next prime is 12018637. The reversal of 12018631 is 13681021.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 12018631 - 2³ = 12018623 is a prime.

It is a super-2 number, since 2×12018631² = 288894982228322, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (12018637) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6009315 + 6009316.

It is an arithmetic number, because the mean of its divisors is an integer number (6009316).

Almost surely, 2^12018631 is an apocalyptic number.

12018631 is a deficient number, since it is larger than the sum of its proper divisors (1).

12018631 is an equidigital number, since it uses as much as digits as its factorization.

12018631 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 288, while the sum is 22.

The square root of 12018631 is about 3466.7897253800. The cubic root of 12018631 is about 229.0612715282.

Adding to 12018631 its reverse (13681021), we get a palindrome (25699652).

The spelling of 12018631 in words is "twelve million, eighteen thousand, six hundred thirty-one".