255560581 has 2 divisors, whose sum is σ = 255560582. Its totient is φ = 255560580.

The previous prime is 255560551. The next prime is 255560587. The reversal of 255560581 is 185065552.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 230007556 + 25553025 = 15166^2 + 5055^2 .

It is a cyclic number.

It is not a de Polignac number, because 255560581 - 2¹³ = 255552389 is a prime.

It is a super-2 number, since 2×255560581² = 130622421122115122, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 255560581.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (255560587) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 127780290 + 127780291.

It is an arithmetic number, because the mean of its divisors is an integer number (127780291).

Almost surely, 2^255560581 is an apocalyptic number.

It is an amenable number.

255560581 is a deficient number, since it is larger than the sum of its proper divisors (1).

255560581 is an equidigital number, since it uses as much as digits as its factorization.

255560581 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 60000, while the sum is 37.

The square root of 255560581 is about 15986.2622585769. The cubic root of 255560581 is about 634.5969136700.

It can be divided in two parts, 2555 and 60581, that added together give a palindrome (63136).

The spelling of 255560581 in words is "two hundred fifty-five million, five hundred sixty thousand, five hundred eighty-one".