634131091 has 8 divisors (see below), whose sum is σ = 721857024. Its totient is φ = 551418120.

The previous prime is 634131089. The next prime is 634131107. The reversal of 634131091 is 190131436.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 634131091 - 2¹ = 634131089 is a prime.

It is not an unprimeable number, because it can be changed into a prime (634135091) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1252971 + ... + 1253476.

It is an arithmetic number, because the mean of its divisors is an integer number (90232128).

Almost surely, 2^634131091 is an apocalyptic number.

634131091 is a deficient number, since it is larger than the sum of its proper divisors (87725933).

634131091 is a wasteful number, since it uses less digits than its factorization.

634131091 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2506481.

The product of its (nonzero) digits is 1944, while the sum is 28.

The square root of 634131091 is about 25181.9596338331. The cubic root of 634131091 is about 859.1315782999.

The spelling of 634131091 in words is "six hundred thirty-four million, one hundred thirty-one thousand, ninety-one".