90190091091 has 4 divisors (see below), whose sum is σ = 120253454792. Its totient is φ = 60126727392.

The previous prime is 90190091077. The next prime is 90190091093. The reversal of 90190091091 is 19019009109.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 90190091091 - 2²⁶ = 90122982227 is a prime.

It is a super-3 number, since 3×90190091091³ (a number of 34 digits) contains 333 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (90190091093) 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, 15031681846 + ... + 15031681851.

It is an arithmetic number, because the mean of its divisors is an integer number (30063363698).

Almost surely, 2^90190091091 is an apocalyptic number.

90190091091 is a deficient number, since it is larger than the sum of its proper divisors (30063363701).

90190091091 is a wasteful number, since it uses less digits than its factorization.

90190091091 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 30063363700.

The product of its (nonzero) digits is 6561, while the sum is 39.

The spelling of 90190091091 in words is "ninety billion, one hundred ninety million, ninety-one thousand, ninety-one".