208320247 has 2 divisors, whose sum is σ = 208320248. Its totient is φ = 208320246.

The previous prime is 208320187. The next prime is 208320271. The reversal of 208320247 is 742023802.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 208320247 - 2¹⁵ = 208287479 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (208320647) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 104160123 + 104160124.

It is an arithmetic number, because the mean of its divisors is an integer number (104160124).

Almost surely, 2^208320247 is an apocalyptic number.

208320247 is a deficient number, since it is larger than the sum of its proper divisors (1).

208320247 is an equidigital number, since it uses as much as digits as its factorization.

208320247 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 5376, while the sum is 28.

The square root of 208320247 is about 14433.3033987372. The cubic root of 208320247 is about 592.8031380374.

The spelling of 208320247 in words is "two hundred eight million, three hundred twenty thousand, two hundred forty-seven".