199245257 has 2 divisors, whose sum is σ = 199245258. Its totient is φ = 199245256.

The previous prime is 199245239. The next prime is 199245289. The reversal of 199245257 is 752542991.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 127148176 + 72097081 = 11276^2 + 8491^2 .

It is a cyclic number.

It is not a de Polignac number, because 199245257 - 2¹⁴ = 199228873 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (199145257) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 99622628 + 99622629.

It is an arithmetic number, because the mean of its divisors is an integer number (99622629).

Almost surely, 2^199245257 is an apocalyptic number.

It is an amenable number.

199245257 is a deficient number, since it is larger than the sum of its proper divisors (1).

199245257 is an equidigital number, since it uses as much as digits as its factorization.

199245257 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 226800, while the sum is 44.

The square root of 199245257 is about 14115.4262068136. The cubic root of 199245257 is about 584.0669930418.

The spelling of 199245257 in words is "one hundred ninety-nine million, two hundred forty-five thousand, two hundred fifty-seven".