1688214217 has 2 divisors, whose sum is σ = 1688214218. Its totient is φ = 1688214216.

The previous prime is 1688214193. The next prime is 1688214251. The reversal of 1688214217 is 7124128861.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1273847481 + 414366736 = 35691^2 + 20356^2 .

It is an emirp because it is prime and its reverse (7124128861) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1688214217 - 2¹⁵ = 1688181449 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1688214217.

It is not a weakly prime, because it can be changed into another prime (1688214317) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 844107108 + 844107109.

It is an arithmetic number, because the mean of its divisors is an integer number (844107109).

Almost surely, 2^1688214217 is an apocalyptic number.

It is an amenable number.

1688214217 is a deficient number, since it is larger than the sum of its proper divisors (1).

1688214217 is an equidigital number, since it uses as much as digits as its factorization.

1688214217 is an evil number, because the sum of its binary digits is even.

The product of its digits is 43008, while the sum is 40.

The square root of 1688214217 is about 41087.8840657438. The cubic root of 1688214217 is about 1190.7187280733.

The spelling of 1688214217 in words is "one billion, six hundred eighty-eight million, two hundred fourteen thousand, two hundred seventeen".