208999841 has 2 divisors, whose sum is σ = 208999842. Its totient is φ = 208999840.

The previous prime is 208999801. The next prime is 208999871. The reversal of 208999841 is 148999802.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 171741025 + 37258816 = 13105^2 + 6104^2 .

It is a cyclic number.

It is not a de Polignac number, because 208999841 - 2¹⁰ = 208998817 is a prime.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 208999841.

It is not a weakly prime, because it can be changed into another prime (208999801) 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, 104499920 + 104499921.

It is an arithmetic number, because the mean of its divisors is an integer number (104499921).

Almost surely, 2^208999841 is an apocalyptic number.

It is an amenable number.

208999841 is a deficient number, since it is larger than the sum of its proper divisors (1).

208999841 is an equidigital number, since it uses as much as digits as its factorization.

208999841 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 373248, while the sum is 50.

The square root of 208999841 is about 14456.8267956699. The cubic root of 208999841 is about 593.4470635486.

The spelling of 208999841 in words is "two hundred eight million, nine hundred ninety-nine thousand, eight hundred forty-one".