99988091 has 8 divisors (see below), whose sum is σ = 114522624. Its totient is φ = 85516200.

The previous prime is 99988073. The next prime is 99988099. The reversal of 99988091 is 19088999.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 99988091 - 2¹⁰ = 99987067 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (99988099) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 12185 + ... + 18666.

It is an arithmetic number, because the mean of its divisors is an integer number (14315328).

Almost surely, 2^99988091 is an apocalyptic number.

99988091 is a deficient number, since it is larger than the sum of its proper divisors (14534533).

99988091 is a wasteful number, since it uses less digits than its factorization.

99988091 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 31321.

The product of its (nonzero) digits is 419904, while the sum is 53.

The square root of 99988091 is about 9999.4045322709. The cubic root of 99988091 is about 464.1404570693.

The spelling of 99988091 in words is "ninety-nine million, nine hundred eighty-eight thousand, ninety-one".