91929191911 has 4 divisors (see below), whose sum is σ = 91929931992. Its totient is φ = 91928451832.

The previous prime is 91929191873. The next prime is 91929191983. The reversal of 91929191911 is 11919192919.

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 a de Polignac number, because none of the positive numbers 2^k-91929191911 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 (91929191311) 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, 133180 + ... + 448993.

It is an arithmetic number, because the mean of its divisors is an integer number (22982482998).

Almost surely, 2^91929191911 is an apocalyptic number.

91929191911 is a deficient number, since it is larger than the sum of its proper divisors (740081).

91929191911 is a wasteful number, since it uses less digits than its factorization.

91929191911 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 740080.

The product of its digits is 118098, while the sum is 52.

The spelling of 91929191911 in words is "ninety-one billion, nine hundred twenty-nine million, one hundred ninety-one thousand, nine hundred eleven".