1718861 has 2 divisors, whose sum is σ = 1718862. Its totient is φ = 1718860.

The previous prime is 1718807. The next prime is 1718863. The reversal of 1718861 is 1688171.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1705636 + 13225 = 1306^2 + 115^2 .

It is a cyclic number.

It is not a de Polignac number, because 1718861 - 2¹⁸ = 1456717 is a prime.

Together with 1718863, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1718863) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 859430 + 859431.

It is an arithmetic number, because the mean of its divisors is an integer number (859431).

2^1718861 is an apocalyptic number.

It is an amenable number.

1718861 is a deficient number, since it is larger than the sum of its proper divisors (1).

1718861 is an equidigital number, since it uses as much as digits as its factorization.

1718861 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 2688, while the sum is 32.

The square root of 1718861 is about 1311.0533932682. The cubic root of 1718861 is about 119.7880750261.

The spelling of 1718861 in words is "one million, seven hundred eighteen thousand, eight hundred sixty-one".