208131017 has 6 divisors (see below), whose sum is σ = 220437018. Its totient is φ = 195832032.

The previous prime is 208130987. The next prime is 208131019. The reversal of 208131017 is 710131802.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 195888016 + 12243001 = 13996^2 + 3499^2 .

It is not a de Polignac number, because 208131017 - 2¹² = 208126921 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 208130983 and 208131001.

It is not an unprimeable number, because it can be changed into a prime (208131019) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 57734 + ... + 61232.

It is an arithmetic number, because the mean of its divisors is an integer number (36739503).

Almost surely, 2^208131017 is an apocalyptic number.

It is an amenable number.

208131017 is a deficient number, since it is larger than the sum of its proper divisors (12306001).

208131017 is an frugal number, since it uses more digits than its factorization.

208131017 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7015 (or 3516 counting only the distinct ones).

The product of its (nonzero) digits is 336, while the sum is 23.

The square root of 208131017 is about 14426.7465840362. The cubic root of 208131017 is about 592.6235905665.

Adding to 208131017 its reverse (710131802), we get a palindrome (918262819).

The spelling of 208131017 in words is "two hundred eight million, one hundred thirty-one thousand, seventeen".