199156019 has 2 divisors, whose sum is σ = 199156020. Its totient is φ = 199156018.

The previous prime is 199155991. The next prime is 199156099. The reversal of 199156019 is 910651991.

It is a weak prime.

It is an emirp because it is prime and its reverse (910651991) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 199156019 - 2¹⁶ = 199090483 is a prime.

It is a super-2 number, since 2×199156019² = 79326239807856722, which contains 22 as substring.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (199156099) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 99578009 + 99578010.

It is an arithmetic number, because the mean of its divisors is an integer number (99578010).

Almost surely, 2^199156019 is an apocalyptic number.

199156019 is a deficient number, since it is larger than the sum of its proper divisors (1).

199156019 is an equidigital number, since it uses as much as digits as its factorization.

199156019 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 21870, while the sum is 41.

The square root of 199156019 is about 14112.2648430364. The cubic root of 199156019 is about 583.9797826788.

The spelling of 199156019 in words is "one hundred ninety-nine million, one hundred fifty-six thousand, nineteen".