631985982 has 32 divisors (see below), whose sum is σ = 1341684000. Its totient is φ = 197772288.

The previous prime is 631985971. The next prime is 631985983. The reversal of 631985982 is 289589136.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (51).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (631985983) 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, 34144 + ... + 49292.

It is an arithmetic number, because the mean of its divisors is an integer number (41927625).

Almost surely, 2^631985982 is an apocalyptic number.

631985982 is an abundant number, since it is smaller than the sum of its proper divisors (709698018).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

631985982 is a wasteful number, since it uses less digits than its factorization.

631985982 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15580.

The product of its digits is 933120, while the sum is 51.

The square root of 631985982 is about 25139.3313753568. The cubic root of 631985982 is about 858.1617405270.

The spelling of 631985982 in words is "six hundred thirty-one million, nine hundred eighty-five thousand, nine hundred eighty-two".