91290623311 has 4 divisors (see below), whose sum is σ = 91446144552. Its totient is φ = 91135102072.

The previous prime is 91290623309. The next prime is 91290623371. The reversal of 91290623311 is 11332609219.

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

It is a cyclic number.

It is not a de Polignac number, because 91290623311 - 2¹ = 91290623309 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (91290623371) 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, 77759740 + ... + 77760913.

It is an arithmetic number, because the mean of its divisors is an integer number (22861536138).

Almost surely, 2^91290623311 is an apocalyptic number.

91290623311 is a deficient number, since it is larger than the sum of its proper divisors (155521241).

91290623311 is a wasteful number, since it uses less digits than its factorization.

91290623311 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 155521240.

The product of its (nonzero) digits is 17496, while the sum is 37.

The spelling of 91290623311 in words is "ninety-one billion, two hundred ninety million, six hundred twenty-three thousand, three hundred eleven".