208238609 has 2 divisors, whose sum is σ = 208238610. Its totient is φ = 208238608.

The previous prime is 208238603. The next prime is 208238621. The reversal of 208238609 is 906832802.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 177955600 + 30283009 = 13340^2 + 5503^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-208238609 is a prime.

It is not a weakly prime, because it can be changed into another prime (208238603) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 104119304 + 104119305.

It is an arithmetic number, because the mean of its divisors is an integer number (104119305).

Almost surely, 2^208238609 is an apocalyptic number.

It is an amenable number.

208238609 is a deficient number, since it is larger than the sum of its proper divisors (1).

208238609 is an equidigital number, since it uses as much as digits as its factorization.

208238609 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 41472, while the sum is 38.

The square root of 208238609 is about 14430.4750095068. The cubic root of 208238609 is about 592.7256906353.

The spelling of 208238609 in words is "two hundred eight million, two hundred thirty-eight thousand, six hundred nine".