208205013 has 4 divisors (see below), whose sum is σ = 277606688. Its totient is φ = 138803340.

The previous prime is 208204999. The next prime is 208205027. The reversal of 208205013 is 310502802.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is an interprime number because it is at equal distance from previous prime (208204999) and next prime (208205027).

It is not a de Polignac number, because 208205013 - 2⁸ = 208204757 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (208205033) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 34700833 + ... + 34700838.

It is an arithmetic number, because the mean of its divisors is an integer number (69401672).

Almost surely, 2^208205013 is an apocalyptic number.

It is an amenable number.

208205013 is a deficient number, since it is larger than the sum of its proper divisors (69401675).

208205013 is an equidigital number, since it uses as much as digits as its factorization.

208205013 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 69401674.

The product of its (nonzero) digits is 480, while the sum is 21.

The square root of 208205013 is about 14429.3108983070. The cubic root of 208205013 is about 592.6938132882.

Adding to 208205013 its reverse (310502802), we get a palindrome (518707815).

The spelling of 208205013 in words is "two hundred eight million, two hundred five thousand, thirteen".