634431311 has 4 divisors (see below), whose sum is σ = 637975800. Its totient is φ = 630886824.

The previous prime is 634431283. The next prime is 634431367. The reversal of 634431311 is 113134436.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 634431311 - 2¹⁰ = 634430287 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 (634401311) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1771976 + ... + 1772333.

It is an arithmetic number, because the mean of its divisors is an integer number (159493950).

Almost surely, 2^634431311 is an apocalyptic number.

634431311 is a deficient number, since it is larger than the sum of its proper divisors (3544489).

634431311 is a wasteful number, since it uses less digits than its factorization.

634431311 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3544488.

The product of its digits is 2592, while the sum is 26.

The square root of 634431311 is about 25187.9199419087. The cubic root of 634431311 is about 859.2671379618.

Adding to 634431311 its reverse (113134436), we get a palindrome (747565747).

The spelling of 634431311 in words is "six hundred thirty-four million, four hundred thirty-one thousand, three hundred eleven".