191713 has 4 divisors (see below), whose sum is σ = 195840. Its totient is φ = 187588.

The previous prime is 191707. The next prime is 191717. The reversal of 191713 is 317191.

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 a de Polignac number, because none of the positive numbers 2^k-191713 is a prime.

It is a Duffinian number.

191713 is a lucky number.

It is not an unprimeable number, because it can be changed into a prime (191717) 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, 1993 + ... + 2086.

It is an arithmetic number, because the mean of its divisors is an integer number (48960).

2¹⁹¹⁷¹³ is an apocalyptic number.

It is an amenable number.

191713 is a deficient number, since it is larger than the sum of its proper divisors (4127).

191713 is an equidigital number, since it uses as much as digits as its factorization.

191713 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4126.

The product of its digits is 189, while the sum is 22.

The square root of 191713 is about 437.8504310835. The cubic root of 191713 is about 57.6612236427.

The spelling of 191713 in words is "one hundred ninety-one thousand, seven hundred thirteen".