634631 has 4 divisors (see below), whose sum is σ = 636672. Its totient is φ = 632592.

The previous prime is 634609. The next prime is 634643. The reversal of 634631 is 136436.

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 634631 - 2⁶ = 634567 is a prime.

It is a super-2 number, since 2×634631² = 805513012322, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 634597 and 634606.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (634651) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 446 + ... + 1211.

It is an arithmetic number, because the mean of its divisors is an integer number (159168).

2⁶³⁴⁶³¹ is an apocalyptic number.

634631 is a deficient number, since it is larger than the sum of its proper divisors (2041).

634631 is a wasteful number, since it uses less digits than its factorization.

634631 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2040.

The product of its digits is 1296, while the sum is 23.

The square root of 634631 is about 796.6373076878. The cubic root of 634631 is about 85.9357280737.

The spelling of 634631 in words is "six hundred thirty-four thousand, six hundred thirty-one".