31211681982 has 16 divisors (see below), whose sum is σ = 67225161360. Its totient is φ = 9603594432.

The previous prime is 31211681959. The next prime is 31211681987. The reversal of 31211681982 is 28918611213.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31211681987) 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 7 ways as a sum of consecutive naturals, for example, 200074807 + ... + 200074962.

It is an arithmetic number, because the mean of its divisors is an integer number (4201572585).

Almost surely, 2^31211681982 is an apocalyptic number.

31211681982 is an abundant number, since it is smaller than the sum of its proper divisors (36013479378).

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

31211681982 is a wasteful number, since it uses less digits than its factorization.

31211681982 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 400149787.

The product of its digits is 41472, while the sum is 42.

It can be divided in two parts, 312 and 11681982, that multiplied together give a square (3644778384 = 60372²).

The spelling of 31211681982 in words is "thirty-one billion, two hundred eleven million, six hundred eighty-one thousand, nine hundred eighty-two".