191996313 has 4 divisors (see below), whose sum is σ = 255995088. Its totient is φ = 127997540.

The previous prime is 191996303. The next prime is 191996381. The reversal of 191996313 is 313699191.

191996313 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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 191996313 - 2⁹ = 191995801 is a prime.

It is not an unprimeable number, because it can be changed into a prime (191996303) 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, 31999383 + ... + 31999388.

It is an arithmetic number, because the mean of its divisors is an integer number (63998772).

Almost surely, 2^191996313 is an apocalyptic number.

It is an amenable number.

191996313 is a deficient number, since it is larger than the sum of its proper divisors (63998775).

191996313 is an equidigital number, since it uses as much as digits as its factorization.

191996313 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 63998774.

The product of its digits is 39366, while the sum is 42.

The square root of 191996313 is about 13856.2734167596. The cubic root of 191996313 is about 576.8961353395.

The spelling of 191996313 in words is "one hundred ninety-one million, nine hundred ninety-six thousand, three hundred thirteen".