199879597 has 2 divisors, whose sum is σ = 199879598. Its totient is φ = 199879596.

The previous prime is 199879517. The next prime is 199879627. The reversal of 199879597 is 795978991.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 119705481 + 80174116 = 10941^2 + 8954^2 .

It is an emirp because it is prime and its reverse (795978991) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 199879597 - 2²³ = 191490989 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (199879517) 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, 99939798 + 99939799.

It is an arithmetic number, because the mean of its divisors is an integer number (99939799).

Almost surely, 2^199879597 is an apocalyptic number.

It is an amenable number.

199879597 is a deficient number, since it is larger than the sum of its proper divisors (1).

199879597 is an equidigital number, since it uses as much as digits as its factorization.

199879597 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 12859560, while the sum is 64.

The square root of 199879597 is about 14137.8780939715. The cubic root of 199879597 is about 584.6861705826.

It can be divided in two parts, 19987 and 9597, that added together give a square (29584 = 172²).

The spelling of 199879597 in words is "one hundred ninety-nine million, eight hundred seventy-nine thousand, five hundred ninety-seven".