90621860091 has 16 divisors (see below), whose sum is σ = 138420038400. Its totient is φ = 51660325728.

The previous prime is 90621860089. The next prime is 90621860137. The reversal of 90621860091 is 19006812609.

It is not a de Polignac number, because 90621860091 - 2¹ = 90621860089 is a prime.

It is not an unprimeable number, because it can be changed into a prime (90621860041) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 5140756 + ... + 5158353.

It is an arithmetic number, because the mean of its divisors is an integer number (8651252400).

Almost surely, 2^90621860091 is an apocalyptic number.

90621860091 is a deficient number, since it is larger than the sum of its proper divisors (47798178309).

90621860091 is a wasteful number, since it uses less digits than its factorization.

90621860091 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10299538.

The product of its (nonzero) digits is 46656, while the sum is 42.

The spelling of 90621860091 in words is "ninety billion, six hundred twenty-one million, eight hundred sixty thousand, ninety-one".