91216899 has 12 divisors (see below), whose sum is σ = 133918512. Its totient is φ = 59814000.

The previous prime is 91216871. The next prime is 91216907. The reversal of 91216899 is 99861219.

It is not a de Polignac number, because 91216899 - 2¹⁶ = 91151363 is a prime.

It is not an unprimeable number, because it can be changed into a prime (91216859) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 82527 + ... + 83624.

It is an arithmetic number, because the mean of its divisors is an integer number (11159876).

Almost surely, 2^91216899 is an apocalyptic number.

91216899 is a deficient number, since it is larger than the sum of its proper divisors (42701613).

91216899 is a wasteful number, since it uses less digits than its factorization.

91216899 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 166218 (or 166215 counting only the distinct ones).

The product of its digits is 69984, while the sum is 45.

The square root of 91216899 is about 9550.7538445926. The cubic root of 91216899 is about 450.1512232496.

The spelling of 91216899 in words is "ninety-one million, two hundred sixteen thousand, eight hundred ninety-nine".