90909191000 has 64 divisors (see below), whose sum is σ = 214833958560. Its totient is φ = 36003600000.

The previous prime is 90909190943. The next prime is 90909191003. The reversal of 90909191000 is 19190909.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (90909191003) 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, 349046 + ... + 551045.

Almost surely, 2^90909191000 is an apocalyptic number.

It is an amenable number.

90909191000 is an abundant number, since it is smaller than the sum of its proper divisors (123924767560).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

90909191000 is a wasteful number, since it uses less digits than its factorization.

90909191000 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 900213 (or 900199 counting only the distinct ones).

The product of its (nonzero) digits is 6561, while the sum is 38.

The spelling of 90909191000 in words is "ninety billion, nine hundred nine million, one hundred ninety-one thousand".