655961 has 2 divisors, whose sum is σ = 655962. Its totient is φ = 655960.

The previous prime is 655943. The next prime is 655987. The reversal of 655961 is 169556.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 430336 + 225625 = 656^2 + 475^2 .

It is a cyclic number.

It is not a de Polignac number, because 655961 - 2¹⁴ = 639577 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (655901) 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, 327980 + 327981.

It is an arithmetic number, because the mean of its divisors is an integer number (327981).

2⁶⁵⁵⁹⁶¹ is an apocalyptic number.

It is an amenable number.

655961 is a deficient number, since it is larger than the sum of its proper divisors (1).

655961 is an equidigital number, since it uses as much as digits as its factorization.

655961 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 8100, while the sum is 32.

The square root of 655961 is about 809.9141929859. The cubic root of 655961 is about 86.8879077831.

The spelling of 655961 in words is "six hundred fifty-five thousand, nine hundred sixty-one".