199185479 has 2 divisors, whose sum is σ = 199185480. Its totient is φ = 199185478.

The previous prime is 199185473. The next prime is 199185487. The reversal of 199185479 is 974581991.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 199185479 - 2¹² = 199181383 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 199185479.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (199185473) 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, 99592739 + 99592740.

It is an arithmetic number, because the mean of its divisors is an integer number (99592740).

Almost surely, 2^199185479 is an apocalyptic number.

199185479 is a deficient number, since it is larger than the sum of its proper divisors (1).

199185479 is an equidigital number, since it uses as much as digits as its factorization.

199185479 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 816480, while the sum is 53.

The square root of 199185479 is about 14113.3085773677. The cubic root of 199185479 is about 584.0085761782.

The spelling of 199185479 in words is "one hundred ninety-nine million, one hundred eighty-five thousand, four hundred seventy-nine".