208061261 has 2 divisors, whose sum is σ = 208061262. Its totient is φ = 208061260.

The previous prime is 208061251. The next prime is 208061279. The reversal of 208061261 is 162160802.

208061261 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 160022500 + 48038761 = 12650^2 + 6931^2 .

It is a cyclic number.

It is not a de Polignac number, because 208061261 - 2²⁶ = 140952397 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 208061261.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (208061251) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 104030630 + 104030631.

It is an arithmetic number, because the mean of its divisors is an integer number (104030631).

Almost surely, 2^208061261 is an apocalyptic number.

It is an amenable number.

208061261 is a deficient number, since it is larger than the sum of its proper divisors (1).

208061261 is an equidigital number, since it uses as much as digits as its factorization.

208061261 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1152, while the sum is 26.

The square root of 208061261 is about 14424.3287885433. The cubic root of 208061261 is about 592.5573763921.

The spelling of 208061261 in words is "two hundred eight million, sixty-one thousand, two hundred sixty-one".