99000091 has 4 divisors (see below), whose sum is σ = 99876312. Its totient is φ = 98123872.

The previous prime is 99000079. The next prime is 99000101. The reversal of 99000091 is 19000099.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 99000091 - 2⁵ = 99000059 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (99000791) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 437941 + ... + 438166.

It is an arithmetic number, because the mean of its divisors is an integer number (24969078).

Almost surely, 2^99000091 is an apocalyptic number.

99000091 is a deficient number, since it is larger than the sum of its proper divisors (876221).

99000091 is a wasteful number, since it uses less digits than its factorization.

99000091 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 876220.

The product of its (nonzero) digits is 729, while the sum is 28.

The square root of 99000091 is about 9949.8789439872. The cubic root of 99000091 is about 462.6066426596.

The spelling of 99000091 in words is "ninety-nine million, ninety-one", and thus it is an aban number and an uban number.