90991991001 has 8 divisors (see below), whose sum is σ = 121453253280. Its totient is φ = 60596028032.

The previous prime is 90991990997. The next prime is 90991991033. The reversal of 90991991001 is 10019919909.

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

It is a cyclic number.

It is not a de Polignac number, because 90991991001 - 2² = 90991990997 is a prime.

It is not an unprimeable number, because it can be changed into a prime (90991991801) 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, 16321575 + ... + 16327148.

It is an arithmetic number, because the mean of its divisors is an integer number (15181656660).

Almost surely, 2^90991991001 is an apocalyptic number.

It is an amenable number.

90991991001 is a deficient number, since it is larger than the sum of its proper divisors (30461262279).

90991991001 is a wasteful number, since it uses less digits than its factorization.

90991991001 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 32649655.

The product of its (nonzero) digits is 59049, while the sum is 48.

The spelling of 90991991001 in words is "ninety billion, nine hundred ninety-one million, nine hundred ninety-one thousand, one".