91319425812 has 48 divisors (see below), whose sum is σ = 237362798400. Its totient is φ = 30361543200.

The previous prime is 91319425789. The next prime is 91319425843. The reversal of 91319425812 is 21852491319.

91319425812 is a `hidden beast` number, since 9 + 13 + 19 + 42 + 581 + 2 = 666.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1044814 + ... + 1128837.

It is an arithmetic number, because the mean of its divisors is an integer number (4945058300).

Almost surely, 2^91319425812 is an apocalyptic number.

It is an amenable number.

91319425812 is an abundant number, since it is smaller than the sum of its proper divisors (146043372588).

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

91319425812 is a wasteful number, since it uses less digits than its factorization.

91319425812 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2174053 (or 2174045 counting only the distinct ones).

The product of its digits is 155520, while the sum is 45.

The spelling of 91319425812 in words is "ninety-one billion, three hundred nineteen million, four hundred twenty-five thousand, eight hundred twelve".