191320868 has 6 divisors (see below), whose sum is σ = 334811526. Its totient is φ = 95660432.

The previous prime is 191320849. The next prime is 191320901. The reversal of 191320868 is 868023191.

191320868 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in only one way, i.e., 179774464 + 11546404 = 13408^2 + 3398^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 23915105 + ... + 23915112.

It is an arithmetic number, because the mean of its divisors is an integer number (55801921).

Almost surely, 2^191320868 is an apocalyptic number.

It is an amenable number.

191320868 is a deficient number, since it is larger than the sum of its proper divisors (143490658).

191320868 is a wasteful number, since it uses less digits than its factorization.

191320868 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 47830221 (or 47830219 counting only the distinct ones).

The product of its (nonzero) digits is 20736, while the sum is 38.

The square root of 191320868 is about 13831.8786865704. The cubic root of 191320868 is about 576.2188316216.

The spelling of 191320868 in words is "one hundred ninety-one million, three hundred twenty thousand, eight hundred sixty-eight".