90099009 has 96 divisors (see below), whose sum is σ = 178424064. Its totient is φ = 42301440.

The previous prime is 90099001. The next prime is 90099091.

90099009 is nontrivially palindromic in base 10.

It is not a de Polignac number, because 90099009 - 2³ = 90099001 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (90099001) by changing a digit.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 657589 + ... + 657725.

It is an arithmetic number, because the mean of its divisors is an integer number (1858584).

Almost surely, 2^90099009 is an apocalyptic number.

90099009 is a gapful number since it is divisible by the number (99) formed by its first and last digit.

It is an amenable number.

90099009 is a deficient number, since it is larger than the sum of its proper divisors (88325055).

90099009 is a wasteful number, since it uses less digits than its factorization.

90099009 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 247 (or 244 counting only the distinct ones).

The product of its (nonzero) digits is 6561, while the sum is 36.

The square root of 90099009 is about 9492.0497786305. The cubic root of 90099009 is about 448.3047475436.

The spelling of 90099009 in words is "ninety million, ninety-nine thousand, nine".