655717 has 2 divisors, whose sum is σ = 655718. Its totient is φ = 655716.

The previous prime is 655693. The next prime is 655723. The reversal of 655717 is 717556.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 630436 + 25281 = 794^2 + 159^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-655717 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (655727) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 327858 + 327859.

It is an arithmetic number, because the mean of its divisors is an integer number (327859).

2⁶⁵⁵⁷¹⁷ is an apocalyptic number.

It is an amenable number.

655717 is a deficient number, since it is larger than the sum of its proper divisors (1).

655717 is an equidigital number, since it uses as much as digits as its factorization.

655717 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 7350, while the sum is 31.

The square root of 655717 is about 809.7635457342. The cubic root of 655717 is about 86.8771331188.

The spelling of 655717 in words is "six hundred fifty-five thousand, seven hundred seventeen".