631888939 has 4 divisors (see below), whose sum is σ = 689333400. Its totient is φ = 574444480.

The previous prime is 631888891. The next prime is 631888951. The reversal of 631888939 is 939888136.

It is a happy number.

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 631888939 - 2⁷ = 631888811 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 631888939.

It is not an unprimeable number, because it can be changed into a prime (631888969) 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, 28722214 + ... + 28722235.

It is an arithmetic number, because the mean of its divisors is an integer number (172333350).

Almost surely, 2^631888939 is an apocalyptic number.

631888939 is a deficient number, since it is larger than the sum of its proper divisors (57444461).

631888939 is a wasteful number, since it uses less digits than its factorization.

631888939 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 57444460.

The product of its digits is 2239488, while the sum is 55.

The square root of 631888939 is about 25137.4011982146. The cubic root of 631888939 is about 858.1178139975.

It can be divided in two parts, 63188 and 8939, that added together give a palindrome (72127).

The spelling of 631888939 in words is "six hundred thirty-one million, eight hundred eighty-eight thousand, nine hundred thirty-nine".