191492313 has 4 divisors (see below), whose sum is σ = 255323088. Its totient is φ = 127661540.

The previous prime is 191492309. The next prime is 191492333. The reversal of 191492313 is 313294191.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 191492313 - 2² = 191492309 is a prime.

It is not an unprimeable number, because it can be changed into a prime (191492303) 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, 31915383 + ... + 31915388.

It is an arithmetic number, because the mean of its divisors is an integer number (63830772).

Almost surely, 2^191492313 is an apocalyptic number.

It is an amenable number.

191492313 is a deficient number, since it is larger than the sum of its proper divisors (63830775).

191492313 is an equidigital number, since it uses as much as digits as its factorization.

191492313 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 63830774.

The product of its digits is 5832, while the sum is 33.

The square root of 191492313 is about 13838.0747577111. The cubic root of 191492313 is about 576.3908991791.

The spelling of 191492313 in words is "one hundred ninety-one million, four hundred ninety-two thousand, three hundred thirteen".