208208993 has 2 divisors, whose sum is σ = 208208994. Its totient is φ = 208208992.

The previous prime is 208208983. The next prime is 208209017. The reversal of 208208993 is 399802802.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 124724224 + 83484769 = 11168^2 + 9137^2 .

It is a cyclic number.

It is not a de Polignac number, because 208208993 - 2⁴ = 208208977 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 208208993.

It is not a weakly prime, because it can be changed into another prime (208208983) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 104104496 + 104104497.

It is an arithmetic number, because the mean of its divisors is an integer number (104104497).

Almost surely, 2^208208993 is an apocalyptic number.

It is an amenable number.

208208993 is a deficient number, since it is larger than the sum of its proper divisors (1).

208208993 is an equidigital number, since it uses as much as digits as its factorization.

208208993 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 62208, while the sum is 41.

The square root of 208208993 is about 14429.4488113718. The cubic root of 208208993 is about 592.6975898645.

The spelling of 208208993 in words is "two hundred eight million, two hundred eight thousand, nine hundred ninety-three".