91129109311 has 4 divisors (see below), whose sum is σ = 91129830232. Its totient is φ = 91128388392.

The previous prime is 91129109303. The next prime is 91129109329. The reversal of 91129109311 is 11390192119.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 91129109311 - 2³ = 91129109303 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 (91129109341) 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, 115245 + ... + 442198.

It is an arithmetic number, because the mean of its divisors is an integer number (22782457558).

Almost surely, 2^91129109311 is an apocalyptic number.

91129109311 is a deficient number, since it is larger than the sum of its proper divisors (720921).

91129109311 is a wasteful number, since it uses less digits than its factorization.

91129109311 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 720920.

The product of its (nonzero) digits is 4374, while the sum is 37.

The spelling of 91129109311 in words is "ninety-one billion, one hundred twenty-nine million, one hundred nine thousand, three hundred eleven".