91194551984 has 20 divisors (see below), whose sum is σ = 176852025984. Its totient is φ = 45555319488.

The previous prime is 91194551963. The next prime is 91194551989. The reversal of 91194551984 is 48915549119.

It is a happy number.

It is a Smith number, since the sum of its digits (56) coincides with the sum of the digits of its prime factors.

It is not an unprimeable number, because it can be changed into a prime (91194551989) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2604347 + ... + 2639130.

Almost surely, 2^91194551984 is an apocalyptic number.

It is an amenable number.

91194551984 is a deficient number, since it is larger than the sum of its proper divisors (85657474000).

91194551984 is a wasteful number, since it uses less digits than its factorization.

91194551984 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5244572 (or 5244566 counting only the distinct ones).

The product of its digits is 2332800, while the sum is 56.

The spelling of 91194551984 in words is "ninety-one billion, one hundred ninety-four million, five hundred fifty-one thousand, nine hundred eighty-four".