31990271982 has 16 divisors (see below), whose sum is σ = 64935478272. Its totient is φ = 10504268280.

The previous prime is 31990271977. The next prime is 31990271987. The reversal of 31990271982 is 28917209913.

It is an interprime number because it is at equal distance from previous prime (31990271977) and next prime (31990271987).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31990271987) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 39788494 + ... + 39789297.

It is an arithmetic number, because the mean of its divisors is an integer number (4058467392).

Almost surely, 2^31990271982 is an apocalyptic number.

31990271982 is an abundant number, since it is smaller than the sum of its proper divisors (32945206290).

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

31990271982 is a wasteful number, since it uses less digits than its factorization.

31990271982 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 79577863.

The product of its (nonzero) digits is 489888, while the sum is 51.

The spelling of 31990271982 in words is "thirty-one billion, nine hundred ninety million, two hundred seventy-one thousand, nine hundred eighty-two".