191312923 has 8 divisors (see below), whose sum is σ = 193134240. Its totient is φ = 189499200.

The previous prime is 191312909. The next prime is 191312963. The reversal of 191312923 is 329213191.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-191312923 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (191312963) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 57111 + ... + 60367.

It is an arithmetic number, because the mean of its divisors is an integer number (24141780).

Almost surely, 2^191312923 is an apocalyptic number.

191312923 is a deficient number, since it is larger than the sum of its proper divisors (1821317).

191312923 is a wasteful number, since it uses less digits than its factorization.

191312923 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3797.

The product of its digits is 2916, while the sum is 31.

The square root of 191312923 is about 13831.5914847135. The cubic root of 191312923 is about 576.2108552797.

The spelling of 191312923 in words is "one hundred ninety-one million, three hundred twelve thousand, nine hundred twenty-three".