634491857 has 2 divisors, whose sum is σ = 634491858. Its totient is φ = 634491856.

The previous prime is 634491839. The next prime is 634491863. The reversal of 634491857 is 758194436.

634491857 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., 581726161 + 52765696 = 24119^2 + 7264^2 .

It is a cyclic number.

It is not a de Polignac number, because 634491857 - 2¹⁰ = 634490833 is a prime.

It is not a weakly prime, because it can be changed into another prime (634491157) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 317245928 + 317245929.

It is an arithmetic number, because the mean of its divisors is an integer number (317245929).

Almost surely, 2^634491857 is an apocalyptic number.

It is an amenable number.

634491857 is a deficient number, since it is larger than the sum of its proper divisors (1).

634491857 is an equidigital number, since it uses as much as digits as its factorization.

634491857 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 725760, while the sum is 47.

The square root of 634491857 is about 25189.1217989036. The cubic root of 634491857 is about 859.2944713823.

The spelling of 634491857 in words is "six hundred thirty-four million, four hundred ninety-one thousand, eight hundred fifty-seven".