191112920 has 16 divisors (see below), whose sum is σ = 430004160. Its totient is φ = 76445152.

The previous prime is 191112919. The next prime is 191112937. The reversal of 191112920 is 29211191.

It is a self number, because there is not a number n which added to its sum of digits gives 191112920.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2388872 + ... + 2388951.

It is an arithmetic number, because the mean of its divisors is an integer number (26875260).

Almost surely, 2^191112920 is an apocalyptic number.

191112920 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

191112920 is an abundant number, since it is smaller than the sum of its proper divisors (238891240).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

191112920 is a wasteful number, since it uses less digits than its factorization.

191112920 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4777834 (or 4777830 counting only the distinct ones).

The product of its (nonzero) digits is 324, while the sum is 26.

The square root of 191112920 is about 13824.3596596732. The cubic root of 191112920 is about 576.0099905032.

The spelling of 191112920 in words is "one hundred ninety-one million, one hundred twelve thousand, nine hundred twenty".