99019091 has 4 divisors (see below), whose sum is σ = 99099000. Its totient is φ = 98939184.

The previous prime is 99019073. The next prime is 99019097. The reversal of 99019091 is 19091099.

It is a happy number.

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 99019091 - 2⁶ = 99019027 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (99019097) 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, 38066 + ... + 40583.

It is an arithmetic number, because the mean of its divisors is an integer number (24774750).

Almost surely, 2^99019091 is an apocalyptic number.

99019091 is a deficient number, since it is larger than the sum of its proper divisors (79909).

99019091 is a wasteful number, since it uses less digits than its factorization.

99019091 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 79908.

The product of its (nonzero) digits is 6561, while the sum is 38.

The square root of 99019091 is about 9950.8336836669. The cubic root of 99019091 is about 462.6362351037.

The spelling of 99019091 in words is "ninety-nine million, nineteen thousand, ninety-one".