561231 has 12 divisors (see below), whose sum is σ = 884520. Its totient is φ = 340080.

The previous prime is 561229. The next prime is 561251. The reversal of 561231 is 132165.

It is not a de Polignac number, because 561231 - 2¹ = 561229 is a prime.

It is a super-2 number, since 2×561231² = 629960470722, which contains 22 as substring.

It is a congruent number.

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

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 2736 + ... + 2933.

It is an arithmetic number, because the mean of its divisors is an integer number (73710).

2⁵⁶¹²³¹ is an apocalyptic number.

561231 is a deficient number, since it is larger than the sum of its proper divisors (323289).

561231 is a wasteful number, since it uses less digits than its factorization.

561231 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5686 (or 5683 counting only the distinct ones).

The product of its digits is 180, while the sum is 18.

The square root of 561231 is about 749.1535223170. The cubic root of 561231 is about 82.4860582502.

Adding to 561231 its reverse (132165), we get a palindrome (693396).

The spelling of 561231 in words is "five hundred sixty-one thousand, two hundred thirty-one".