1608688217 has 2 divisors, whose sum is σ = 1608688218. Its totient is φ = 1608688216.

The previous prime is 1608688199. The next prime is 1608688229. The reversal of 1608688217 is 7128868061.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 845879056 + 762809161 = 29084^2 + 27619^2 .

It is a cyclic number.

It is not a de Polignac number, because 1608688217 - 2¹⁴ = 1608671833 is a prime.

It is not a weakly prime, because it can be changed into another prime (1608688247) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 804344108 + 804344109.

It is an arithmetic number, because the mean of its divisors is an integer number (804344109).

Almost surely, 2^1608688217 is an apocalyptic number.

It is an amenable number.

1608688217 is a deficient number, since it is larger than the sum of its proper divisors (1).

1608688217 is an equidigital number, since it uses as much as digits as its factorization.

1608688217 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 258048, while the sum is 47.

The square root of 1608688217 is about 40108.4556795696. The cubic root of 1608688217 is about 1171.7203165807.

The spelling of 1608688217 in words is "one billion, six hundred eight million, six hundred eighty-eight thousand, two hundred seventeen".