199880279 has 2 divisors, whose sum is σ = 199880280. Its totient is φ = 199880278.

The previous prime is 199880273. The next prime is 199880287. The reversal of 199880279 is 972088991.

It is a weak prime.

It is an emirp because it is prime and its reverse (972088991) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-199880279 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 199880279.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (199880273) 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, 99940139 + 99940140.

It is an arithmetic number, because the mean of its divisors is an integer number (99940140).

Almost surely, 2^199880279 is an apocalyptic number.

199880279 is a deficient number, since it is larger than the sum of its proper divisors (1).

199880279 is an equidigital number, since it uses as much as digits as its factorization.

199880279 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 653184, while the sum is 53.

The square root of 199880279 is about 14137.9022135535. The cubic root of 199880279 is about 584.6868355755.

The spelling of 199880279 in words is "one hundred ninety-nine million, eight hundred eighty thousand, two hundred seventy-nine".