31691091012 has 48 divisors (see below), whose sum is σ = 84581038080. Its totient is φ = 9046940832.

The previous prime is 31691091011. The next prime is 31691091017. The reversal of 31691091012 is 21019019613.

It is not an unprimeable number, because it can be changed into a prime (31691091011) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 59212 + ... + 258627.

It is an arithmetic number, because the mean of its divisors is an integer number (1762104960).

Almost surely, 2^31691091012 is an apocalyptic number.

It is an amenable number.

31691091012 is an abundant number, since it is smaller than the sum of its proper divisors (52889947068).

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

31691091012 is a wasteful number, since it uses less digits than its factorization.

31691091012 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 319040 (or 319038 counting only the distinct ones).

The product of its (nonzero) digits is 2916, while the sum is 33.

The spelling of 31691091012 in words is "thirty-one billion, six hundred ninety-one million, ninety-one thousand, twelve".