191320867 has 4 divisors (see below), whose sum is σ = 191587680. Its totient is φ = 191054056.

The previous prime is 191320849. The next prime is 191320901. The reversal of 191320867 is 768023191.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 768023191 = 13 ⋅59078707.

It is a cyclic number.

It is not a de Polignac number, because 191320867 - 2²⁷ = 57103139 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (191320807) 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, 132328 + ... + 133765.

It is an arithmetic number, because the mean of its divisors is an integer number (47896920).

Almost surely, 2^191320867 is an apocalyptic number.

191320867 is a deficient number, since it is larger than the sum of its proper divisors (266813).

191320867 is an equidigital number, since it uses as much as digits as its factorization.

191320867 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 266812.

The product of its (nonzero) digits is 18144, while the sum is 37.

The square root of 191320867 is about 13831.8786504220. The cubic root of 191320867 is about 576.2188306177.

The spelling of 191320867 in words is "one hundred ninety-one million, three hundred twenty thousand, eight hundred sixty-seven".