255969561 has 16 divisors (see below), whose sum is σ = 361929600. Its totient is φ = 160359168.

The previous prime is 255969557. The next prime is 255969569. The reversal of 255969561 is 165969552.

It is not a de Polignac number, because 255969561 - 2² = 255969557 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 255969561.

It is not an unprimeable number, because it can be changed into a prime (255969569) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 32620 + ... + 39698.

It is an arithmetic number, because the mean of its divisors is an integer number (22620600).

Almost surely, 2^255969561 is an apocalyptic number.

It is an amenable number.

255969561 is a deficient number, since it is larger than the sum of its proper divisors (105960039).

255969561 is a wasteful number, since it uses less digits than its factorization.

255969561 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7808.

The product of its digits is 729000, while the sum is 48.

The square root of 255969561 is about 15999.0487529728. The cubic root of 255969561 is about 634.9352536957.

Subtracting from 255969561 its reverse (165969552), we obtain a palindrome (90000009).

The spelling of 255969561 in words is "two hundred fifty-five million, nine hundred sixty-nine thousand, five hundred sixty-one".