634317989 has 4 divisors (see below), whose sum is σ = 661897056. Its totient is φ = 606738924.

The previous prime is 634317941. The next prime is 634317997. The reversal of 634317989 is 989713436.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 634317989 - 2²⁴ = 617540773 is a prime.

It is a super-2 number, since 2×634317989² = 804718622338008242, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (634317919) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 13789499 + ... + 13789544.

It is an arithmetic number, because the mean of its divisors is an integer number (165474264).

Almost surely, 2^634317989 is an apocalyptic number.

It is an amenable number.

634317989 is a deficient number, since it is larger than the sum of its proper divisors (27579067).

634317989 is a wasteful number, since it uses less digits than its factorization.

634317989 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 27579066.

The product of its digits is 979776, while the sum is 50.

The square root of 634317989 is about 25185.6703107144. The cubic root of 634317989 is about 859.2159742046.

The spelling of 634317989 in words is "six hundred thirty-four million, three hundred seventeen thousand, nine hundred eighty-nine".