99090090181 has 16 divisors (see below), whose sum is σ = 100909186560. Its totient is φ = 97286267520.

The previous prime is 99090090173. The next prime is 99090090221. The reversal of 99090090181 is 18109009099.

It is a cyclic number.

It is not a de Polignac number, because 99090090181 - 2³ = 99090090173 is a prime.

It is a super-2 number, since 2×99090090181² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (99090090881) 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 15 ways as a sum of consecutive naturals, for example, 15698016 + ... + 15704326.

It is an arithmetic number, because the mean of its divisors is an integer number (6306824160).

Almost surely, 2^99090090181 is an apocalyptic number.

It is an amenable number.

99090090181 is a deficient number, since it is larger than the sum of its proper divisors (1819096379).

99090090181 is a wasteful number, since it uses less digits than its factorization.

99090090181 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7476.

The product of its (nonzero) digits is 52488, while the sum is 46.

The spelling of 99090090181 in words is "ninety-nine billion, ninety million, ninety thousand, one hundred eighty-one".