1712621 has 2 divisors, whose sum is σ = 1712622. Its totient is φ = 1712620.

The previous prime is 1712617. The next prime is 1712629. The reversal of 1712621 is 1262171.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1590121 + 122500 = 1261^2 + 350^2 .

It is a cyclic number.

It is not a de Polignac number, because 1712621 - 2² = 1712617 is a prime.

It is a Sophie Germain prime.

It is a Chen prime.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 1712593 and 1712602.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1712629) 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, 856310 + 856311.

It is an arithmetic number, because the mean of its divisors is an integer number (856311).

2^1712621 is an apocalyptic number.

It is an amenable number.

1712621 is a deficient number, since it is larger than the sum of its proper divisors (1).

1712621 is an equidigital number, since it uses as much as digits as its factorization.

1712621 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 168, while the sum is 20.

The square root of 1712621 is about 1308.6714637372. The cubic root of 1712621 is about 119.6429432708.

Adding to 1712621 its reverse (1262171), we get a palindrome (2974792).

The spelling of 1712621 in words is "one million, seven hundred twelve thousand, six hundred twenty-one".