90818190919191 has 16 divisors (see below), whose sum is σ = 121109579945984. Its totient is φ = 60536131773984.

The previous prime is 90818190919091. The next prime is 90818190919217. The reversal of 90818190919191 is 19191909181809.

It is not a de Polignac number, because 90818190919191 - 2²⁶ = 90818123810327 is a prime.

It is a super-2 number, since 2×90818190919191² (a number of 29 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (90818190919091) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1306833441 + ... + 1306902933.

It is an arithmetic number, because the mean of its divisors is an integer number (7569348746624).

Almost surely, 2^{90818190919191} is an apocalyptic number.

90818190919191 is a deficient number, since it is larger than the sum of its proper divisors (30291389026793).

90818190919191 is a wasteful number, since it uses less digits than its factorization.

90818190919191 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 130350.

The product of its (nonzero) digits is 3779136, while the sum is 66.

The spelling of 90818190919191 in words is "ninety trillion, eight hundred eighteen billion, one hundred ninety million, nine hundred nineteen thousand, one hundred ninety-one".