99980091 has 6 divisors (see below), whose sum is σ = 144415700. Its totient is φ = 66653388.

The previous prime is 99980087. The next prime is 99980123. The reversal of 99980091 is 19008999.

It is not a de Polignac number, because 99980091 - 2² = 99980087 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (99980291) 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 5 ways as a sum of consecutive naturals, for example, 5554441 + ... + 5554458.

Almost surely, 2^99980091 is an apocalyptic number.

99980091 is a deficient number, since it is larger than the sum of its proper divisors (44435609).

99980091 is a wasteful number, since it uses less digits than its factorization.

99980091 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11108905 (or 11108902 counting only the distinct ones).

The product of its (nonzero) digits is 52488, while the sum is 45.

The square root of 99980091 is about 9999.0045004490. The cubic root of 99980091 is about 464.1280781862.

The spelling of 99980091 in words is "ninety-nine million, nine hundred eighty thousand, ninety-one".