631901992 has 8 divisors (see below), whose sum is σ = 1184816250. Its totient is φ = 315950992.

The previous prime is 631901983. The next prime is 631901999. The reversal of 631901992 is 299109136.

It can be written as a sum of positive squares in only one way, i.e., 606439876 + 25462116 = 24626^2 + 5046^2 .

It is a tau number, because it is divible by the number of its divisors (8).

It is not an unprimeable number, because it can be changed into a prime (631901999) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 39493867 + ... + 39493882.

Almost surely, 2^631901992 is an apocalyptic number.

It is an amenable number.

631901992 is a deficient number, since it is larger than the sum of its proper divisors (552914258).

631901992 is a wasteful number, since it uses less digits than its factorization.

631901992 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 78987755 (or 78987751 counting only the distinct ones).

The product of its (nonzero) digits is 26244, while the sum is 40.

The square root of 631901992 is about 25137.6608299181. The cubic root of 631901992 is about 858.1237227018.

The spelling of 631901992 in words is "six hundred thirty-one million, nine hundred one thousand, nine hundred ninety-two".