99090999 has 64 divisors (see below), whose sum is σ = 176256000. Its totient is φ = 53827200.

The previous prime is 99090989. The next prime is 99091001. The reversal of 99090999 is 99909099.

It is not a de Polignac number, because 99090999 - 2⁵ = 99090967 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (99090989) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 553492 + ... + 553670.

It is an arithmetic number, because the mean of its divisors is an integer number (2754000).

Almost surely, 2^99090999 is an apocalyptic number.

99090999 is a deficient number, since it is larger than the sum of its proper divisors (77165001).

99090999 is a wasteful number, since it uses less digits than its factorization.

99090999 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 325 (or 319 counting only the distinct ones).

The product of its (nonzero) digits is 531441, while the sum is 54.

The square root of 99090999 is about 9954.4461925313. The cubic root of 99090999 is about 462.7481973404.

The spelling of 99090999 in words is "ninety-nine million, ninety thousand, nine hundred ninety-nine".