208318013 has 2 divisors, whose sum is σ = 208318014. Its totient is φ = 208318012.

The previous prime is 208317997. The next prime is 208318021. The reversal of 208318013 is 310813802.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 133702969 + 74615044 = 11563^2 + 8638^2 .

It is a cyclic number.

It is not a de Polignac number, because 208318013 - 2⁴ = 208317997 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (208318213) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 104159006 + 104159007.

It is an arithmetic number, because the mean of its divisors is an integer number (104159007).

Almost surely, 2^208318013 is an apocalyptic number.

It is an amenable number.

208318013 is a deficient number, since it is larger than the sum of its proper divisors (1).

208318013 is an equidigital number, since it uses as much as digits as its factorization.

208318013 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1152, while the sum is 26.

The square root of 208318013 is about 14433.2260080690. The cubic root of 208318013 is about 592.8010189812.

The spelling of 208318013 in words is "two hundred eight million, three hundred eighteen thousand, thirteen".