255605581 has 8 divisors (see below), whose sum is σ = 318677184. Its totient is φ = 199173120.

The previous prime is 255605579. The next prime is 255605587. The reversal of 255605581 is 185506552.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 255605581 - 2¹ = 255605579 is a prime.

It is a super-2 number, since 2×255605581² = 130668426076695122, 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 255605581.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (255605587) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1659700 + ... + 1659853.

It is an arithmetic number, because the mean of its divisors is an integer number (39834648).

Almost surely, 2^255605581 is an apocalyptic number.

It is an amenable number.

255605581 is a deficient number, since it is larger than the sum of its proper divisors (63071603).

255605581 is a wasteful number, since it uses less digits than its factorization.

255605581 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3319571.

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

The square root of 255605581 is about 15987.6696550811. The cubic root of 255605581 is about 634.6341588313.

The spelling of 255605581 in words is "two hundred fifty-five million, six hundred five thousand, five hundred eighty-one".