91916899 has 4 divisors (see below), whose sum is σ = 91939536. Its totient is φ = 91894264.

The previous prime is 91916879. The next prime is 91916911. The reversal of 91916899 is 99861919.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 99861919 = 9397 ⋅10627.

It is a cyclic number.

It is not a de Polignac number, because 91916899 - 2¹⁵ = 91884131 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (91916849) 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, 3364 + ... + 13969.

It is an arithmetic number, because the mean of its divisors is an integer number (22984884).

Almost surely, 2^91916899 is an apocalyptic number.

91916899 is a deficient number, since it is larger than the sum of its proper divisors (22637).

91916899 is a wasteful number, since it uses less digits than its factorization.

91916899 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22636.

The product of its digits is 314928, while the sum is 52.

The square root of 91916899 is about 9587.3301288732. The cubic root of 91916899 is about 451.2997795520.

The spelling of 91916899 in words is "ninety-one million, nine hundred sixteen thousand, eight hundred ninety-nine".