99820091 has 16 divisors (see below), whose sum is σ = 120687360. Its totient is φ = 80650080.

The previous prime is 99820087. The next prime is 99820103. The reversal of 99820091 is 19002899.

It is not a de Polignac number, because 99820091 - 2² = 99820087 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (99820051) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 26285 + ... + 29841.

It is an arithmetic number, because the mean of its divisors is an integer number (7542960).

Almost surely, 2^99820091 is an apocalyptic number.

99820091 is a deficient number, since it is larger than the sum of its proper divisors (20867269).

99820091 is a wasteful number, since it uses less digits than its factorization.

99820091 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3794.

The product of its (nonzero) digits is 11664, while the sum is 38.

The square root of 99820091 is about 9991.0005004504. Note that the first 3 decimals coincide. The cubic root of 99820091 is about 463.8803617308.

The spelling of 99820091 in words is "ninety-nine million, eight hundred twenty thousand, ninety-one".