1713221 has 2 divisors, whose sum is σ = 1713222. Its totient is φ = 1713220.

The previous prime is 1713181. The next prime is 1713223. The reversal of 1713221 is 1223171.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1050625 + 662596 = 1025^2 + 814^2 .

It is a cyclic number.

It is not a de Polignac number, because 1713221 - 2¹⁰ = 1712197 is a prime.

It is a Sophie Germain prime.

Together with 1713223, it forms a pair of twin primes.

It is a Chen prime.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 1713221.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1713223) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 856610 + 856611.

It is an arithmetic number, because the mean of its divisors is an integer number (856611).

2^1713221 is an apocalyptic number.

It is an amenable number.

1713221 is a deficient number, since it is larger than the sum of its proper divisors (1).

1713221 is an equidigital number, since it uses as much as digits as its factorization.

1713221 is an evil number, because the sum of its binary digits is even.

The product of its digits is 84, while the sum is 17.

The square root of 1713221 is about 1308.9006837801. The cubic root of 1713221 is about 119.6569135507.

Adding to 1713221 its reverse (1223171), we get a palindrome (2936392).

The spelling of 1713221 in words is "one million, seven hundred thirteen thousand, two hundred twenty-one".