623431631 has 4 divisors (see below), whose sum is σ = 624796272. Its totient is φ = 622066992.

The previous prime is 623431619. The next prime is 623431637. The reversal of 623431631 is 136134326.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-623431631 is a prime.

It is a super-2 number, since 2×623431631² = 777333997062640322, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 623431594 and 623431603.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (623431637) 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 in 3 ways as a sum of consecutive naturals, for example, 681635 + ... + 682548.

It is an arithmetic number, because the mean of its divisors is an integer number (156199068).

Almost surely, 2^623431631 is an apocalyptic number.

623431631 is a deficient number, since it is larger than the sum of its proper divisors (1364641).

623431631 is a wasteful number, since it uses less digits than its factorization.

623431631 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1364640.

The product of its digits is 7776, while the sum is 29.

The square root of 623431631 is about 24968.6129170204. The cubic root of 623431631 is about 854.2722080884.

Adding to 623431631 its reverse (136134326), we get a palindrome (759565957).

The spelling of 623431631 in words is "six hundred twenty-three million, four hundred thirty-one thousand, six hundred thirty-one".