208964891 has 2 divisors, whose sum is σ = 208964892. Its totient is φ = 208964890.

The previous prime is 208964839. The next prime is 208964897. The reversal of 208964891 is 198469802.

208964891 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 208964891 - 2¹⁴ = 208948507 is a prime.

It is a Sophie Germain prime.

It is not a weakly prime, because it can be changed into another prime (208964897) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 104482445 + 104482446.

It is an arithmetic number, because the mean of its divisors is an integer number (104482446).

Almost surely, 2^208964891 is an apocalyptic number.

208964891 is a deficient number, since it is larger than the sum of its proper divisors (1).

208964891 is an equidigital number, since it uses as much as digits as its factorization.

208964891 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 248832, while the sum is 47.

The square root of 208964891 is about 14455.6179736461. The cubic root of 208964891 is about 593.4139819746.

The spelling of 208964891 in words is "two hundred eight million, nine hundred sixty-four thousand, eight hundred ninety-one".