208561849 has 2 divisors, whose sum is σ = 208561850. Its totient is φ = 208561848.

The previous prime is 208561807. The next prime is 208561891. The reversal of 208561849 is 948165802.

It is a happy number.

It is a balanced prime because it is at equal distance from previous prime (208561807) and next prime (208561891).

It can be written as a sum of positive squares in only one way, i.e., 205205625 + 3356224 = 14325^2 + 1832^2 .

It is a cyclic number.

It is not a de Polignac number, because 208561849 - 2⁷ = 208561721 is a prime.

It is not a weakly prime, because it can be changed into another prime (208565849) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 104280924 + 104280925.

It is an arithmetic number, because the mean of its divisors is an integer number (104280925).

Almost surely, 2^208561849 is an apocalyptic number.

It is an amenable number.

208561849 is a deficient number, since it is larger than the sum of its proper divisors (1).

208561849 is an equidigital number, since it uses as much as digits as its factorization.

208561849 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 138240, while the sum is 43.

The square root of 208561849 is about 14441.6705751101. The cubic root of 208561849 is about 593.0322197733.

The spelling of 208561849 in words is "two hundred eight million, five hundred sixty-one thousand, eight hundred forty-nine".