199820249 has 2 divisors, whose sum is σ = 199820250. Its totient is φ = 199820248.

The previous prime is 199820213. The next prime is 199820281. The reversal of 199820249 is 942028991.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 193905625 + 5914624 = 13925^2 + 2432^2 .

It is a cyclic number.

It is not a de Polignac number, because 199820249 - 2¹² = 199816153 is a prime.

It is not a weakly prime, because it can be changed into another prime (199820209) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 99910124 + 99910125.

It is an arithmetic number, because the mean of its divisors is an integer number (99910125).

Almost surely, 2^199820249 is an apocalyptic number.

It is an amenable number.

199820249 is a deficient number, since it is larger than the sum of its proper divisors (1).

199820249 is an equidigital number, since it uses as much as digits as its factorization.

199820249 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 93312, while the sum is 44.

The square root of 199820249 is about 14135.7790376052. The cubic root of 199820249 is about 584.6282967587.

The spelling of 199820249 in words is "one hundred ninety-nine million, eight hundred twenty thousand, two hundred forty-nine".