623694491 has 12 divisors (see below), whose sum is σ = 736354728. Its totient is φ = 526613472.

The previous prime is 623694479. The next prime is 623694509. The reversal of 623694491 is 194496326.

It is a happy number.

623694491 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a de Polignac number, because none of the positive numbers 2^k-623694491 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (623694431) 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, 91706 + ... + 98271.

It is an arithmetic number, because the mean of its divisors is an integer number (61362894).

Almost surely, 2^623694491 is an apocalyptic number.

623694491 is a deficient number, since it is larger than the sum of its proper divisors (112660237).

623694491 is a wasteful number, since it uses less digits than its factorization.

623694491 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 190058 (or 190051 counting only the distinct ones).

The product of its digits is 279936, while the sum is 44.

The square root of 623694491 is about 24973.8761709111. The cubic root of 623694491 is about 854.3922546335.

The spelling of 623694491 in words is "six hundred twenty-three million, six hundred ninety-four thousand, four hundred ninety-one".