99191805 has 16 divisors (see below), whose sum is σ = 158907840. Its totient is φ = 52835328.

The previous prime is 99191777. The next prime is 99191849. The reversal of 99191805 is 50819199.

It is not a de Polignac number, because 99191805 - 2⁵ = 99191773 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 9501 + ... + 16989.

It is an arithmetic number, because the mean of its divisors is an integer number (9931740).

Almost surely, 2^99191805 is an apocalyptic number.

It is an amenable number.

99191805 is a deficient number, since it is larger than the sum of its proper divisors (59716035).

99191805 is a wasteful number, since it uses less digits than its factorization.

99191805 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8380.

The product of its (nonzero) digits is 29160, while the sum is 42.

The square root of 99191805 is about 9959.5082709941. The cubic root of 99191805 is about 462.9050632038.

The spelling of 99191805 in words is "ninety-nine million, one hundred ninety-one thousand, eight hundred five".