31021870940 has 12 divisors (see below), whose sum is σ = 65145929016. Its totient is φ = 12408748368.

The previous prime is 31021870927. The next prime is 31021870949. The reversal of 31021870940 is 4907812013.

It is a self number, because there is not a number n which added to its sum of digits gives 31021870940.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31021870949) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 775546754 + ... + 775546793.

It is an arithmetic number, because the mean of its divisors is an integer number (5428827418).

Almost surely, 2^31021870940 is an apocalyptic number.

It is an amenable number.

31021870940 is an abundant number, since it is smaller than the sum of its proper divisors (34124058076).

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

31021870940 is a wasteful number, since it uses less digits than its factorization.

31021870940 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1551093556 (or 1551093554 counting only the distinct ones).

The product of its (nonzero) digits is 12096, while the sum is 35.

The spelling of 31021870940 in words is "thirty-one billion, twenty-one million, eight hundred seventy thousand, nine hundred forty".