199880609 has 2 divisors, whose sum is σ = 199880610. Its totient is φ = 199880608.

The previous prime is 199880581. The next prime is 199880687. The reversal of 199880609 is 906088991.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 189337600 + 10543009 = 13760^2 + 3247^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-199880609 is a prime.

It is not a weakly prime, because it can be changed into another prime (199880689) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 99940304 + 99940305.

It is an arithmetic number, because the mean of its divisors is an integer number (99940305).

Almost surely, 2^199880609 is an apocalyptic number.

It is an amenable number.

199880609 is a deficient number, since it is larger than the sum of its proper divisors (1).

199880609 is an equidigital number, since it uses as much as digits as its factorization.

199880609 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 279936, while the sum is 50.

The square root of 199880609 is about 14137.9138843041. The cubic root of 199880609 is about 584.6871573456.

The spelling of 199880609 in words is "one hundred ninety-nine million, eight hundred eighty thousand, six hundred nine".