91112878 has 4 divisors (see below), whose sum is σ = 136669320. Its totient is φ = 45556438.

The previous prime is 91112869. The next prime is 91112893. The reversal of 91112878 is 87821119.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 87821119 = 2333 ⋅37643.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 22778218 + ... + 22778221.

It is an arithmetic number, because the mean of its divisors is an integer number (34167330).

Almost surely, 2^91112878 is an apocalyptic number.

91112878 is a deficient number, since it is larger than the sum of its proper divisors (45556442).

91112878 is a wasteful number, since it uses less digits than its factorization.

91112878 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 45556441.

The product of its digits is 8064, while the sum is 37.

The square root of 91112878 is about 9545.3065953902. The cubic root of 91112878 is about 449.9800452057.

The spelling of 91112878 in words is "ninety-one million, one hundred twelve thousand, eight hundred seventy-eight".