199189993 has 2 divisors, whose sum is σ = 199189994. Its totient is φ = 199189992.

The previous prime is 199189967. The next prime is 199190021. The reversal of 199189993 is 399981991.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 190357209 + 8832784 = 13797^2 + 2972^2 .

It is an emirp because it is prime and its reverse (399981991) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-199189993 is a prime.

It is a super-2 number, since 2×199189993² = 79353306622680098, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (199189943) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 99594996 + 99594997.

It is an arithmetic number, because the mean of its divisors is an integer number (99594997).

Almost surely, 2^199189993 is an apocalyptic number.

It is an amenable number.

199189993 is a deficient number, since it is larger than the sum of its proper divisors (1).

199189993 is an equidigital number, since it uses as much as digits as its factorization.

199189993 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1417176, while the sum is 58.

The square root of 199189993 is about 14113.4684964398. The cubic root of 199189993 is about 584.0129878030.

The spelling of 199189993 in words is "one hundred ninety-nine million, one hundred eighty-nine thousand, nine hundred ninety-three".