556261 has 2 divisors, whose sum is σ = 556262. Its totient is φ = 556260.

The previous prime is 556253. The next prime is 556267. The reversal of 556261 is 162655.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 324900 + 231361 = 570^2 + 481^2 .

It is a cyclic number.

It is not a de Polignac number, because 556261 - 2³ = 556253 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (556267) by changing a digit.

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

It is a good prime.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 278130 + 278131.

It is an arithmetic number, because the mean of its divisors is an integer number (278131).

2⁵⁵⁶²⁶¹ is an apocalyptic number.

It is an amenable number.

556261 is a deficient number, since it is larger than the sum of its proper divisors (1).

556261 is an equidigital number, since it uses as much as digits as its factorization.

556261 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1800, while the sum is 25.

The square root of 556261 is about 745.8290688891. The cubic root of 556261 is about 82.2418499391.

The spelling of 556261 in words is "five hundred fifty-six thousand, two hundred sixty-one".