31289091252 has 24 divisors (see below), whose sum is σ = 73353894432. Its totient is φ = 10380266400.

The previous prime is 31289091203. The next prime is 31289091293. The reversal of 31289091252 is 25219098213.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 6176199 + ... + 6181262.

It is an arithmetic number, because the mean of its divisors is an integer number (3056412268).

Almost surely, 2^31289091252 is an apocalyptic number.

It is an amenable number.

31289091252 is an abundant number, since it is smaller than the sum of its proper divisors (42064803180).

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

31289091252 is a wasteful number, since it uses less digits than its factorization.

31289091252 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12357679 (or 12357677 counting only the distinct ones).

The product of its (nonzero) digits is 77760, while the sum is 42.

The spelling of 31289091252 in words is "thirty-one billion, two hundred eighty-nine million, ninety-one thousand, two hundred fifty-two".