208139713 has 2 divisors, whose sum is σ = 208139714. Its totient is φ = 208139712.

The previous prime is 208139707. The next prime is 208139731. The reversal of 208139713 is 317931802.

Together with next prime (208139731) it forms an Ormiston pair, because they use the same digits, order apart.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 175615504 + 32524209 = 13252^2 + 5703^2 .

It is a cyclic number.

It is not a de Polignac number, because 208139713 - 2⁹ = 208139201 is a prime.

It is not a weakly prime, because it can be changed into another prime (208139773) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 104069856 + 104069857.

It is an arithmetic number, because the mean of its divisors is an integer number (104069857).

Almost surely, 2^208139713 is an apocalyptic number.

It is an amenable number.

208139713 is a deficient number, since it is larger than the sum of its proper divisors (1).

208139713 is an equidigital number, since it uses as much as digits as its factorization.

208139713 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 9072, while the sum is 34.

The square root of 208139713 is about 14427.0479655403. The cubic root of 208139713 is about 592.6318439943.

The spelling of 208139713 in words is "two hundred eight million, one hundred thirty-nine thousand, seven hundred thirteen".