631707889 has 2 divisors, whose sum is σ = 631707890. Its totient is φ = 631707888.

The previous prime is 631707859. The next prime is 631707893. The reversal of 631707889 is 988707136.

631707889 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 406707889 + 225000000 = 20167^2 + 15000^2 .

It is a cyclic number.

It is not a de Polignac number, because 631707889 - 2⁷ = 631707761 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (631707829) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 315853944 + 315853945.

It is an arithmetic number, because the mean of its divisors is an integer number (315853945).

Almost surely, 2^631707889 is an apocalyptic number.

It is an amenable number.

631707889 is a deficient number, since it is larger than the sum of its proper divisors (1).

631707889 is an equidigital number, since it uses as much as digits as its factorization.

631707889 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 508032, while the sum is 49.

The square root of 631707889 is about 25133.7997326310. The cubic root of 631707889 is about 858.0358496621.

The spelling of 631707889 in words is "six hundred thirty-one million, seven hundred seven thousand, eight hundred eighty-nine".