208761361 has 2 divisors, whose sum is σ = 208761362. Its totient is φ = 208761360.

The previous prime is 208761359. The next prime is 208761373. The reversal of 208761361 is 163167802.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 194435136 + 14326225 = 13944^2 + 3785^2 .

It is a cyclic number.

It is not a de Polignac number, because 208761361 - 2¹ = 208761359 is a prime.

Together with 208761359, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (208761391) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 104380680 + 104380681.

It is an arithmetic number, because the mean of its divisors is an integer number (104380681).

Almost surely, 2^208761361 is an apocalyptic number.

It is an amenable number.

208761361 is a deficient number, since it is larger than the sum of its proper divisors (1).

208761361 is an equidigital number, since it uses as much as digits as its factorization.

208761361 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 12096, while the sum is 34.

The square root of 208761361 is about 14448.5764350679. The cubic root of 208761361 is about 593.2212593590.

The spelling of 208761361 in words is "two hundred eight million, seven hundred sixty-one thousand, three hundred sixty-one".