199105679 has 2 divisors, whose sum is σ = 199105680. Its totient is φ = 199105678.

The previous prime is 199105657. The next prime is 199105703. The reversal of 199105679 is 976501991.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-199105679 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (199105639) 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, 99552839 + 99552840.

It is an arithmetic number, because the mean of its divisors is an integer number (99552840).

Almost surely, 2^199105679 is an apocalyptic number.

199105679 is a deficient number, since it is larger than the sum of its proper divisors (1).

199105679 is an equidigital number, since it uses as much as digits as its factorization.

199105679 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 153090, while the sum is 47.

The square root of 199105679 is about 14110.4811753533. The cubic root of 199105679 is about 583.9305749945.

It can be divided in two parts, 19 and 9105679, that multiplied together give a triangular number (173007901 = T₁₈₆₀₁).

The spelling of 199105679 in words is "one hundred ninety-nine million, one hundred five thousand, six hundred seventy-nine".