85191719 has 2 divisors, whose sum is σ = 85191720. Its totient is φ = 85191718.

The previous prime is 85191707. The next prime is 85191721. The reversal of 85191719 is 91719158.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-85191719 is a prime.

It is a super-2 number, since 2×85191719² = 14515257972349922, which contains 22 as substring.

Together with 85191721, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (85191739) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 42595859 + 42595860.

It is an arithmetic number, because the mean of its divisors is an integer number (42595860).

Almost surely, 2^85191719 is an apocalyptic number.

85191719 is a deficient number, since it is larger than the sum of its proper divisors (1).

85191719 is an equidigital number, since it uses as much as digits as its factorization.

85191719 is an evil number, because the sum of its binary digits is even.

The product of its digits is 22680, while the sum is 41.

The square root of 85191719 is about 9229.9360236136. The cubic root of 85191719 is about 440.0132898878.

The spelling of 85191719 in words is "eighty-five million, one hundred ninety-one thousand, seven hundred nineteen".