208872817 has 4 divisors (see below), whose sum is σ = 208918260. Its totient is φ = 208827376.

The previous prime is 208872809. The next prime is 208872893. The reversal of 208872817 is 718278802.

208872817 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 172764736 + 36108081 = 13144^2 + 6009^2 .

It is a cyclic number.

It is not a de Polignac number, because 208872817 - 2³ = 208872809 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (208872317) 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, 14938 + ... + 25315.

It is an arithmetic number, because the mean of its divisors is an integer number (52229565).

Almost surely, 2^208872817 is an apocalyptic number.

It is an amenable number.

208872817 is a deficient number, since it is larger than the sum of its proper divisors (45443).

208872817 is an equidigital number, since it uses as much as digits as its factorization.

208872817 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 45442.

The product of its (nonzero) digits is 100352, while the sum is 43.

The square root of 208872817 is about 14452.4329093755. The cubic root of 208872817 is about 593.3268125853.

The spelling of 208872817 in words is "two hundred eight million, eight hundred seventy-two thousand, eight hundred seventeen".