199880489 has 2 divisors, whose sum is σ = 199880490. Its totient is φ = 199880488.

The previous prime is 199880479. The next prime is 199880491. The reversal of 199880489 is 984088991.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 171610000 + 28270489 = 13100^2 + 5317^2 .

It is an emirp because it is prime and its reverse (984088991) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 199880489 - 2¹² = 199876393 is a prime.

It is a Sophie Germain prime.

Together with 199880491, it forms a pair of twin primes.

It is a Chen prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (199880479) by changing a digit.

It is a good prime.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 99940244 + 99940245.

It is an arithmetic number, because the mean of its divisors is an integer number (99940245).

Almost surely, 2^199880489 is an apocalyptic number.

It is an amenable number.

199880489 is a deficient number, since it is larger than the sum of its proper divisors (1).

199880489 is an equidigital number, since it uses as much as digits as its factorization.

199880489 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1492992, while the sum is 56.

The square root of 199880489 is about 14137.9096403959. The cubic root of 199880489 is about 584.6870403383.

The spelling of 199880489 in words is "one hundred ninety-nine million, eight hundred eighty thousand, four hundred eighty-nine".