918191510091 has 12 divisors (see below), whose sum is σ = 1326332403760. Its totient is φ = 612101929680.

The previous prime is 918191510081. The next prime is 918191510113. The reversal of 918191510091 is 190015191819.

918191510091 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 918191510091 - 2⁵ = 918191510059 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (918191510081) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1918156 + ... + 2348553.

Almost surely, 2^918191510091 is an apocalyptic number.

918191510091 is a deficient number, since it is larger than the sum of its proper divisors (408140893669).

918191510091 is a wasteful number, since it uses less digits than its factorization.

918191510091 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4290626 (or 4290623 counting only the distinct ones).

The product of its (nonzero) digits is 29160, while the sum is 45.

The spelling of 918191510091 in words is "nine hundred eighteen billion, one hundred ninety-one million, five hundred ten thousand, ninety-one".