90911930091 has 16 divisors (see below), whose sum is σ = 121869684000. Its totient is φ = 60281919488.

The previous prime is 90911930077. The next prime is 90911930101. The reversal of 90911930091 is 19003911909.

It is a cyclic number.

It is not a de Polignac number, because 90911930091 - 2⁷ = 90911929963 is a prime.

It is a super-3 number, since 3×90911930091³ (a number of 34 digits) contains 333 as substring.

It is not an unprimeable number, because it can be changed into a prime (90911930041) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 320545 + ... + 533453.

It is an arithmetic number, because the mean of its divisors is an integer number (7616855250).

Almost surely, 2^90911930091 is an apocalyptic number.

90911930091 is a deficient number, since it is larger than the sum of its proper divisors (30957753909).

90911930091 is a wasteful number, since it uses less digits than its factorization.

90911930091 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 213678.

The product of its (nonzero) digits is 19683, while the sum is 42.

The spelling of 90911930091 in words is "ninety billion, nine hundred eleven million, nine hundred thirty thousand, ninety-one".