91091092012 has 12 divisors (see below), whose sum is σ = 159634252960. Its totient is φ = 45481305456.

The previous prime is 91091092009. The next prime is 91091092033. The reversal of 91091092012 is 21029019019.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 16056948 + ... + 16062619.

Almost surely, 2^91091092012 is an apocalyptic number.

It is an amenable number.

91091092012 is a deficient number, since it is larger than the sum of its proper divisors (68543160948).

91091092012 is a wasteful number, since it uses less digits than its factorization.

91091092012 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 32120280 (or 32120278 counting only the distinct ones).

The product of its (nonzero) digits is 2916, while the sum is 34.

The spelling of 91091092012 in words is "ninety-one billion, ninety-one million, ninety-two thousand, twelve".