199606679 has 2 divisors, whose sum is σ = 199606680. Its totient is φ = 199606678.

The previous prime is 199606663. The next prime is 199606691. The reversal of 199606679 is 976606991.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 199606679 - 2⁴ = 199606663 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 199606679.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (199606699) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 99803339 + 99803340.

It is an arithmetic number, because the mean of its divisors is an integer number (99803340).

Almost surely, 2^199606679 is an apocalyptic number.

199606679 is a deficient number, since it is larger than the sum of its proper divisors (1).

199606679 is an equidigital number, since it uses as much as digits as its factorization.

199606679 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1102248, while the sum is 53.

The square root of 199606679 is about 14128.2227827848. Note that the first 3 decimals coincide. The cubic root of 199606679 is about 584.4199368687.

The spelling of 199606679 in words is "one hundred ninety-nine million, six hundred six thousand, six hundred seventy-nine".