561256 has 8 divisors (see below), whose sum is σ = 1052370. Its totient is φ = 280624.

The previous prime is 561251. The next prime is 561277. The reversal of 561256 is 652165.

It can be written as a sum of positive squares in only one way, i.e., 538756 + 22500 = 734^2 + 150^2 .

It is a tau number, because it is divible by the number of its divisors (8).

It is an alternating number because its digits alternate between odd and even.

It is a self number, because there is not a number n which added to its sum of digits gives 561256.

It is not an unprimeable number, because it can be changed into a prime (561251) by changing a digit.

561256 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 35071 + ... + 35086.

2⁵⁶¹²⁵⁶ is an apocalyptic number.

It is an amenable number.

561256 is a deficient number, since it is larger than the sum of its proper divisors (491114).

561256 is a wasteful number, since it uses less digits than its factorization.

561256 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 70163 (or 70159 counting only the distinct ones).

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

The square root of 561256 is about 749.1702076297. The cubic root of 561256 is about 82.4872830108.

Subtracting 561256 from its reverse (652165), we obtain a palindrome (90909).

The spelling of 561256 in words is "five hundred sixty-one thousand, two hundred fifty-six".