91955574987 has 8 divisors (see below), whose sum is σ = 122608834560. Its totient is φ = 61303016040.

The previous prime is 91955574983. The next prime is 91955575009. The reversal of 91955574987 is 78947555919.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 91955574987 - 2² = 91955574983 is a prime.

It is not an unprimeable number, because it can be changed into a prime (91955574983) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 419562 + ... + 599952.

It is an arithmetic number, because the mean of its divisors is an integer number (15326104320).

Almost surely, 2^91955574987 is an apocalyptic number.

91955574987 is a deficient number, since it is larger than the sum of its proper divisors (30653259573).

91955574987 is a wasteful number, since it uses less digits than its factorization.

91955574987 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 350313.

The product of its digits is 142884000, while the sum is 69.

The spelling of 91955574987 in words is "ninety-one billion, nine hundred fifty-five million, five hundred seventy-four thousand, nine hundred eighty-seven".