631634 has 8 divisors (see below), whose sum is σ = 951420. Its totient is φ = 314496.

The previous prime is 631619. The next prime is 631643. The reversal of 631634 is 436136.

It can be written as a sum of positive squares in 2 ways, for example, as 511225 + 120409 = 715^2 + 347^2 .

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

It is an Ulam number.

It is an unprimeable number.

631634 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 122 + ... + 1130.

2⁶³¹⁶³⁴ is an apocalyptic number.

631634 is a deficient number, since it is larger than the sum of its proper divisors (319786).

631634 is a wasteful number, since it uses less digits than its factorization.

631634 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1324.

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

The square root of 631634 is about 794.7540500054. The cubic root of 631634 is about 85.8002394387.

The spelling of 631634 in words is "six hundred thirty-one thousand, six hundred thirty-four".