631712623 has 2 divisors, whose sum is σ = 631712624. Its totient is φ = 631712622.

The previous prime is 631712621. The next prime is 631712633. The reversal of 631712623 is 326217136.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 631712623 - 2¹ = 631712621 is a prime.

Together with 631712621, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (631712621) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 315856311 + 315856312.

It is an arithmetic number, because the mean of its divisors is an integer number (315856312).

Almost surely, 2^631712623 is an apocalyptic number.

631712623 is a deficient number, since it is larger than the sum of its proper divisors (1).

631712623 is an equidigital number, since it uses as much as digits as its factorization.

631712623 is an evil number, because the sum of its binary digits is even.

The product of its digits is 9072, while the sum is 31.

The square root of 631712623 is about 25133.8939084257. The cubic root of 631712623 is about 858.0379930217.

Adding to 631712623 its reverse (326217136), we get a palindrome (957929759).

The spelling of 631712623 in words is "six hundred thirty-one million, seven hundred twelve thousand, six hundred twenty-three".