91977306712 has 16 divisors (see below), whose sum is σ = 172499279400. Its totient is φ = 45977498880.

The previous prime is 91977306697. The next prime is 91977306727. The reversal of 91977306712 is 21760377919.

It is an interprime number because it is at equal distance from previous prime (91977306697) and next prime (91977306727).

It is a self number, because there is not a number n which added to its sum of digits gives 91977306712.

It is a congruent number.

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, 1359214 + ... + 1425277.

Almost surely, 2^91977306712 is an apocalyptic number.

It is an amenable number.

91977306712 is a deficient number, since it is larger than the sum of its proper divisors (80521972688).

91977306712 is a wasteful number, since it uses less digits than its factorization.

91977306712 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2788626 (or 2788622 counting only the distinct ones).

The product of its (nonzero) digits is 1000188, while the sum is 52.

The spelling of 91977306712 in words is "ninety-one billion, nine hundred seventy-seven million, three hundred six thousand, seven hundred twelve".