199987253 has 2 divisors, whose sum is σ = 199987254. Its totient is φ = 199987252.

The previous prime is 199987241. The next prime is 199987259. The reversal of 199987253 is 352789991.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 152349649 + 47637604 = 12343^2 + 6902^2 .

It is an emirp because it is prime and its reverse (352789991) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 199987253 - 2⁴ = 199987237 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 199987195 and 199987204.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (199987259) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 99993626 + 99993627.

It is an arithmetic number, because the mean of its divisors is an integer number (99993627).

Almost surely, 2^199987253 is an apocalyptic number.

It is an amenable number.

199987253 is a deficient number, since it is larger than the sum of its proper divisors (1).

199987253 is an equidigital number, since it uses as much as digits as its factorization.

199987253 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1224720, while the sum is 53.

The square root of 199987253 is about 14141.6849420428. The cubic root of 199987253 is about 584.7911232272.

The spelling of 199987253 in words is "one hundred ninety-nine million, nine hundred eighty-seven thousand, two hundred fifty-three".