634959871 has 24 divisors (see below), whose sum is σ = 797610624. Its totient is φ = 494825760.

The previous prime is 634959869. The next prime is 634959881. The reversal of 634959871 is 178959436.

It is a happy number.

It is not a de Polignac number, because 634959871 - 2¹ = 634959869 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (634959881) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 75256 + ... + 83266.

It is an arithmetic number, because the mean of its divisors is an integer number (33233776).

Almost surely, 2^634959871 is an apocalyptic number.

634959871 is a deficient number, since it is larger than the sum of its proper divisors (162650753).

634959871 is a wasteful number, since it uses less digits than its factorization.

634959871 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8111 (or 8098 counting only the distinct ones).

The product of its digits is 1632960, while the sum is 52.

The square root of 634959871 is about 25198.4100887338. The cubic root of 634959871 is about 859.5056971045.

It can be divided in two parts, 634959 and 871, that multiplied together give a square (553049289 = 23517²).

The spelling of 634959871 in words is "six hundred thirty-four million, nine hundred fifty-nine thousand, eight hundred seventy-one".