90090909109 has 4 divisors (see below), whose sum is σ = 90423348160. Its totient is φ = 89758470060.

The previous prime is 90090909101. The next prime is 90090909113. The reversal of 90090909109 is 90190909009.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 90090909109 - 2³ = 90090909101 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (90090909101) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 166219119 + ... + 166219660.

It is an arithmetic number, because the mean of its divisors is an integer number (22605837040).

Almost surely, 2^90090909109 is an apocalyptic number.

It is an amenable number.

90090909109 is a deficient number, since it is larger than the sum of its proper divisors (332439051).

90090909109 is a wasteful number, since it uses less digits than its factorization.

90090909109 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 332439050.

The product of its (nonzero) digits is 59049, while the sum is 46.

The spelling of 90090909109 in words is "ninety billion, ninety million, nine hundred nine thousand, one hundred nine".