630172931 has 2 divisors, whose sum is σ = 630172932. Its totient is φ = 630172930.

The previous prime is 630172919. The next prime is 630172951. The reversal of 630172931 is 139271036.

It is a happy number.

630172931 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 630172931 - 2²² = 625978627 is a prime.

It is a super-2 number, since 2×630172931² = 794235845930261522, which contains 22 as substring.

It is a Chen prime.

It is equal to p_32815805 and since 630172931 and 32815805 have the same sum of digits, it is a Honaker prime.

It is not a weakly prime, because it can be changed into another prime (630172951) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 315086465 + 315086466.

It is an arithmetic number, because the mean of its divisors is an integer number (315086466).

Almost surely, 2^630172931 is an apocalyptic number.

630172931 is a deficient number, since it is larger than the sum of its proper divisors (1).

630172931 is an equidigital number, since it uses as much as digits as its factorization.

630172931 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 6804, while the sum is 32.

The square root of 630172931 is about 25103.2454276335. The cubic root of 630172931 is about 857.3403187040.

The spelling of 630172931 in words is "six hundred thirty million, one hundred seventy-two thousand, nine hundred thirty-one".