199221719 has 2 divisors, whose sum is σ = 199221720. Its totient is φ = 199221718.

The previous prime is 199221713. The next prime is 199221731. The reversal of 199221719 is 917122991.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 199221719 - 2⁴ = 199221703 is a prime.

It is a super-2 number, since 2×199221719² = 79378586642629922, which contains 22 as substring.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (199221713) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 99610859 + 99610860.

It is an arithmetic number, because the mean of its divisors is an integer number (99610860).

Almost surely, 2^199221719 is an apocalyptic number.

199221719 is a deficient number, since it is larger than the sum of its proper divisors (1).

199221719 is an equidigital number, since it uses as much as digits as its factorization.

199221719 is an evil number, because the sum of its binary digits is even.

The product of its digits is 20412, while the sum is 41.

The square root of 199221719 is about 14114.5924135272. The cubic root of 199221719 is about 584.0439923934.

The spelling of 199221719 in words is "one hundred ninety-nine million, two hundred twenty-one thousand, seven hundred nineteen".