631888871 has 4 divisors (see below), whose sum is σ = 665146200. Its totient is φ = 598631544.

The previous prime is 631888837. The next prime is 631888883. The reversal of 631888871 is 178888136.

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 631888871 - 2¹⁸ = 631626727 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 (631888811) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 16628636 + ... + 16628673.

It is an arithmetic number, because the mean of its divisors is an integer number (166286550).

Almost surely, 2^631888871 is an apocalyptic number.

631888871 is a deficient number, since it is larger than the sum of its proper divisors (33257329).

631888871 is a wasteful number, since it uses less digits than its factorization.

631888871 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 33257328.

The product of its digits is 516096, while the sum is 50.

The square root of 631888871 is about 25137.3998456483. The cubic root of 631888871 is about 858.1177832157.

The spelling of 631888871 in words is "six hundred thirty-one million, eight hundred eighty-eight thousand, eight hundred seventy-one".