90505000091 has 8 divisors (see below), whose sum is σ = 98802817200. Its totient is φ = 82218864640.

The previous prime is 90505000087. The next prime is 90505000093. The reversal of 90505000091 is 19000050509.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 90505000091 - 2² = 90505000087 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (90505000093) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2904206 + ... + 2935203.

It is an arithmetic number, because the mean of its divisors is an integer number (12350352150).

Almost surely, 2^90505000091 is an apocalyptic number.

90505000091 is a deficient number, since it is larger than the sum of its proper divisors (8297817109).

90505000091 is a wasteful number, since it uses less digits than its factorization.

90505000091 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5840829.

The product of its (nonzero) digits is 2025, while the sum is 29.

The spelling of 90505000091 in words is "ninety billion, five hundred five million, ninety-one", and thus it is an aban number.