631939 has 16 divisors (see below), whose sum is σ = 817920. Its totient is φ = 473760.

The previous prime is 631937. The next prime is 631979. The reversal of 631939 is 939136.

It is not a de Polignac number, because 631939 - 2¹ = 631937 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 631939.

It is not an unprimeable number, because it can be changed into a prime (631931) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2092 + ... + 2374.

It is an arithmetic number, because the mean of its divisors is an integer number (51120).

2⁶³¹⁹³⁹ is an apocalyptic number.

631939 is a deficient number, since it is larger than the sum of its proper divisors (185981).

631939 is a wasteful number, since it uses less digits than its factorization.

631939 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 330.

The product of its digits is 4374, while the sum is 31.

The square root of 631939 is about 794.9459101096. The cubic root of 631939 is about 85.8140474679.

It can be divided in two parts, 63 and 1939, that added together give a palindrome (2002).

The spelling of 631939 in words is "six hundred thirty-one thousand, nine hundred thirty-nine".