199213979 has 2 divisors, whose sum is σ = 199213980. Its totient is φ = 199213978.

The previous prime is 199213943. The next prime is 199214009. The reversal of 199213979 is 979312991.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-199213979 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (199213919) 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, 99606989 + 99606990.

It is an arithmetic number, because the mean of its divisors is an integer number (99606990).

Almost surely, 2^199213979 is an apocalyptic number.

199213979 is a deficient number, since it is larger than the sum of its proper divisors (1).

199213979 is an equidigital number, since it uses as much as digits as its factorization.

199213979 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 275562, while the sum is 50.

The square root of 199213979 is about 14114.3182265386. The cubic root of 199213979 is about 584.0364286950.

The spelling of 199213979 in words is "one hundred ninety-nine million, two hundred thirteen thousand, nine hundred seventy-nine".