618738631 has 12 divisors (see below), whose sum is σ = 721950600. Its totient is φ = 528731280.

The previous prime is 618738611. The next prime is 618738643. The reversal of 618738631 is 136837816.

618738631 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 618738631 - 2⁵ = 618738599 is a prime.

It is a super-2 number, since 2×618738631² = 765674986983508322, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (618738611) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 2856 + ... + 35293.

It is an arithmetic number, because the mean of its divisors is an integer number (60162550).

Almost surely, 2^618738631 is an apocalyptic number.

618738631 is a deficient number, since it is larger than the sum of its proper divisors (103211969).

618738631 is a wasteful number, since it uses less digits than its factorization.

618738631 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 38494 (or 38487 counting only the distinct ones).

The product of its digits is 145152, while the sum is 43.

The square root of 618738631 is about 24874.4574011173. The cubic root of 618738631 is about 852.1232413545.

It can be divided in two parts, 618738 and 631, that added together give a square (619369 = 787²).

The spelling of 618738631 in words is "six hundred eighteen million, seven hundred thirty-eight thousand, six hundred thirty-one".