208851161 has 2 divisors, whose sum is σ = 208851162. Its totient is φ = 208851160.

The previous prime is 208851151. The next prime is 208851163. The reversal of 208851161 is 161158802.

208851161 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 208513600 + 337561 = 14440^2 + 581^2 .

It is a cyclic number.

It is not a de Polignac number, because 208851161 - 2¹⁰ = 208850137 is a prime.

It is a Sophie Germain prime.

Together with 208851163, it forms a pair of twin primes.

It is a Chen prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (208851163) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 104425580 + 104425581.

It is an arithmetic number, because the mean of its divisors is an integer number (104425581).

Almost surely, 2^208851161 is an apocalyptic number.

It is an amenable number.

208851161 is a deficient number, since it is larger than the sum of its proper divisors (1).

208851161 is an equidigital number, since it uses as much as digits as its factorization.

208851161 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 3840, while the sum is 32.

The square root of 208851161 is about 14451.6836735378. The cubic root of 208851161 is about 593.3063064391.

The spelling of 208851161 in words is "two hundred eight million, eight hundred fifty-one thousand, one hundred sixty-one".