631620623 has 2 divisors, whose sum is σ = 631620624. Its totient is φ = 631620622.

The previous prime is 631620611. The next prime is 631620631. The reversal of 631620623 is 326026136.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-631620623 is a prime.

It is a super-2 number, since 2×631620623² = 797889222797816258, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (631620643) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 315810311 + 315810312.

It is an arithmetic number, because the mean of its divisors is an integer number (315810312).

Almost surely, 2^631620623 is an apocalyptic number.

631620623 is a deficient number, since it is larger than the sum of its proper divisors (1).

631620623 is an equidigital number, since it uses as much as digits as its factorization.

631620623 is an evil number, because the sum of its binary digits is even.

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

The square root of 631620623 is about 25132.0636438793. The cubic root of 631620623 is about 857.9963373041.

Adding to 631620623 its reverse (326026136), we get a palindrome (957646759).

The spelling of 631620623 in words is "six hundred thirty-one million, six hundred twenty thousand, six hundred twenty-three".