618043631 has 2 divisors, whose sum is σ = 618043632. Its totient is φ = 618043630.

The previous prime is 618043627. The next prime is 618043637. The reversal of 618043631 is 136340816.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 618043631 - 2² = 618043627 is a prime.

It is a super-2 number, since 2×618043631² = 763955859639328322, which contains 22 as substring.

It is a Chen prime.

It is equal to p_32216576 and since 618043631 and 32216576 have the same sum of digits, it is a Honaker prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (618043637) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 309021815 + 309021816.

It is an arithmetic number, because the mean of its divisors is an integer number (309021816).

Almost surely, 2^618043631 is an apocalyptic number.

618043631 is a deficient number, since it is larger than the sum of its proper divisors (1).

618043631 is an equidigital number, since it uses as much as digits as its factorization.

618043631 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 10368, while the sum is 32.

The square root of 618043631 is about 24860.4833219308. The cubic root of 618043631 is about 851.8040718370.

The spelling of 618043631 in words is "six hundred eighteen million, forty-three thousand, six hundred thirty-one".