199988497 has 2 divisors, whose sum is σ = 199988498. Its totient is φ = 199988496.

The previous prime is 199988491. The next prime is 199988507. The reversal of 199988497 is 794889991.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 164454976 + 35533521 = 12824^2 + 5961^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-199988497 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (199988491) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 99994248 + 99994249.

It is an arithmetic number, because the mean of its divisors is an integer number (99994249).

Almost surely, 2^199988497 is an apocalyptic number.

It is an amenable number.

199988497 is a deficient number, since it is larger than the sum of its proper divisors (1).

199988497 is an equidigital number, since it uses as much as digits as its factorization.

199988497 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 11757312, while the sum is 64.

The square root of 199988497 is about 14141.7289254179. The cubic root of 199988497 is about 584.7923357689.

The spelling of 199988497 in words is "one hundred ninety-nine million, nine hundred eighty-eight thousand, four hundred ninety-seven".