208688461 has 2 divisors, whose sum is σ = 208688462. Its totient is φ = 208688460.

The previous prime is 208688449. The next prime is 208688471. The reversal of 208688461 is 164886802.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 207532836 + 1155625 = 14406^2 + 1075^2 .

It is a cyclic number.

It is not a de Polignac number, because 208688461 - 2⁵ = 208688429 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (208688471) 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, 104344230 + 104344231.

It is an arithmetic number, because the mean of its divisors is an integer number (104344231).

Almost surely, 2^208688461 is an apocalyptic number.

It is an amenable number.

208688461 is a deficient number, since it is larger than the sum of its proper divisors (1).

208688461 is an equidigital number, since it uses as much as digits as its factorization.

208688461 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 147456, while the sum is 43.

The square root of 208688461 is about 14446.0534749114. The cubic root of 208688461 is about 593.1521998606.

The spelling of 208688461 in words is "two hundred eight million, six hundred eighty-eight thousand, four hundred sixty-one".