90908190909 has 24 divisors (see below), whose sum is σ = 135011071104. Its totient is φ = 58909032000.

The previous prime is 90908190907. The next prime is 90908190953. The reversal of 90908190909 is 90909180909.

It is not a de Polignac number, because 90908190909 - 2¹ = 90908190907 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (90908190907) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 354547 + ... + 554544.

It is an arithmetic number, because the mean of its divisors is an integer number (5625461296).

Almost surely, 2^90908190909 is an apocalyptic number.

It is an amenable number.

90908190909 is a deficient number, since it is larger than the sum of its proper divisors (44102880195).

90908190909 is a wasteful number, since it uses less digits than its factorization.

90908190909 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 909409 (or 909406 counting only the distinct ones).

The product of its (nonzero) digits is 472392, while the sum is 54.

The spelling of 90908190909 in words is "ninety billion, nine hundred eight million, one hundred ninety thousand, nine hundred nine".