199487489 has 2 divisors, whose sum is σ = 199487490. Its totient is φ = 199487488.

The previous prime is 199487471. The next prime is 199487501. The reversal of 199487489 is 984784991.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 188650225 + 10837264 = 13735^2 + 3292^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-199487489 is a prime.

It is not a weakly prime, because it can be changed into another prime (199487089) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 99743744 + 99743745.

It is an arithmetic number, because the mean of its divisors is an integer number (99743745).

Almost surely, 2^199487489 is an apocalyptic number.

It is an amenable number.

199487489 is a deficient number, since it is larger than the sum of its proper divisors (1).

199487489 is an equidigital number, since it uses as much as digits as its factorization.

199487489 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 5225472, while the sum is 59.

The square root of 199487489 is about 14124.0040002826. The cubic root of 199487489 is about 584.3035899243.

The spelling of 199487489 in words is "one hundred ninety-nine million, four hundred eighty-seven thousand, four hundred eighty-nine".