208834721 has 2 divisors, whose sum is σ = 208834722. Its totient is φ = 208834720.

The previous prime is 208834709. The next prime is 208834739. The reversal of 208834721 is 127438802.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 140541025 + 68293696 = 11855^2 + 8264^2 .

It is a cyclic number.

It is not a de Polignac number, because 208834721 - 2⁶ = 208834657 is a prime.

It is a super-2 number, since 2×208834721² = 87223881390295682, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (208834741) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 104417360 + 104417361.

It is an arithmetic number, because the mean of its divisors is an integer number (104417361).

Almost surely, 2^208834721 is an apocalyptic number.

It is an amenable number.

208834721 is a deficient number, since it is larger than the sum of its proper divisors (1).

208834721 is an equidigital number, since it uses as much as digits as its factorization.

208834721 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 21504, while the sum is 35.

The square root of 208834721 is about 14451.1148704866. The cubic root of 208834721 is about 593.2907383960.

The spelling of 208834721 in words is "two hundred eight million, eight hundred thirty-four thousand, seven hundred twenty-one".