91929191912 has 16 divisors (see below), whose sum is σ = 176375775840. Its totient is φ = 44895651696.

The previous prime is 91929191873. The next prime is 91929191983. The reversal of 91929191912 is 21919192919.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 133617668 + ... + 133618355.

It is an arithmetic number, because the mean of its divisors is an integer number (11023485990).

Almost surely, 2^91929191912 is an apocalyptic number.

It is an amenable number.

91929191912 is a deficient number, since it is larger than the sum of its proper divisors (84446583928).

91929191912 is a wasteful number, since it uses less digits than its factorization.

91929191912 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 267236072 (or 267236068 counting only the distinct ones).

The product of its digits is 236196, while the sum is 53.

The spelling of 91929191912 in words is "ninety-one billion, nine hundred twenty-nine million, one hundred ninety-one thousand, nine hundred twelve".