208816841 has 4 divisors (see below), whose sum is σ = 208859412. Its totient is φ = 208774272.

The previous prime is 208816787. The next prime is 208816889. The reversal of 208816841 is 148618802.

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 130051216 + 78765625 = 11404^2 + 8875^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-208816841 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 208816795 and 208816804.

It is not an unprimeable number, because it can be changed into a prime (208816891) 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 in 3 ways as a sum of consecutive naturals, for example, 12800 + ... + 24113.

It is an arithmetic number, because the mean of its divisors is an integer number (52214853).

Almost surely, 2^208816841 is an apocalyptic number.

It is an amenable number.

208816841 is a deficient number, since it is larger than the sum of its proper divisors (42571).

208816841 is an equidigital number, since it uses as much as digits as its factorization.

208816841 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 42570.

The product of its (nonzero) digits is 24576, while the sum is 38.

The square root of 208816841 is about 14450.4962198535. The cubic root of 208816841 is about 593.2738058012.

The spelling of 208816841 in words is "two hundred eight million, eight hundred sixteen thousand, eight hundred forty-one".