31101980 has 96 divisors (see below), whose sum is σ = 83994624. Its totient is φ = 9402624.

The previous prime is 31101979. The next prime is 31101989. The reversal of 31101980 is 8910113.

It is a Harshad number since it is a multiple of its sum of digits (23).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31101989) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 41489 + ... + 42231.

It is an arithmetic number, because the mean of its divisors is an integer number (874944).

Almost surely, 2^31101980 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 31101980, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (41997312).

31101980 is an abundant number, since it is smaller than the sum of its proper divisors (52892644).

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

31101980 is a wasteful number, since it uses less digits than its factorization.

31101980 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 795 (or 793 counting only the distinct ones).

The product of its (nonzero) digits is 216, while the sum is 23.

The square root of 31101980 is about 5576.9149177659. The cubic root of 31101980 is about 314.4821591618.

The spelling of 31101980 in words is "thirty-one million, one hundred one thousand, nine hundred eighty".