208103261 has 4 divisors (see below), whose sum is σ = 208844124. Its totient is φ = 207362400.

The previous prime is 208103227. The next prime is 208103267. The reversal of 208103261 is 162301802.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 62900761 + 145202500 = 7931^2 + 12050^2 .

It is a cyclic number.

It is not a de Polignac number, because 208103261 - 2¹⁴ = 208086877 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (208103267) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 370010 + ... + 370571.

It is an arithmetic number, because the mean of its divisors is an integer number (52211031).

Almost surely, 2^208103261 is an apocalyptic number.

It is an amenable number.

208103261 is a deficient number, since it is larger than the sum of its proper divisors (740863).

208103261 is an equidigital number, since it uses as much as digits as its factorization.

208103261 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 740862.

The product of its (nonzero) digits is 576, while the sum is 23.

The square root of 208103261 is about 14425.7845887148. The cubic root of 208103261 is about 592.5972456359.

The spelling of 208103261 in words is "two hundred eight million, one hundred three thousand, two hundred sixty-one".