561532231 has 8 divisors (see below), whose sum is σ = 605122784. Its totient is φ = 517998240.

The previous prime is 561532217. The next prime is 561532241. The reversal of 561532231 is 132235165.

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 561532231 - 2⁵ = 561532199 is a prime.

It is a super-2 number, since 2×561532231² = 630636892903674722, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 561532231.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (561532241) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 7750 + ... + 34396.

It is an arithmetic number, because the mean of its divisors is an integer number (75640348).

Almost surely, 2^561532231 is an apocalyptic number.

561532231 is a deficient number, since it is larger than the sum of its proper divisors (43590553).

561532231 is a wasteful number, since it uses less digits than its factorization.

561532231 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 28281.

The product of its digits is 5400, while the sum is 28.

The square root of 561532231 is about 23696.6713063249. The cubic root of 561532231 is about 825.0081326410.

Adding to 561532231 its reverse (132235165), we get a palindrome (693767396).

The spelling of 561532231 in words is "five hundred sixty-one million, five hundred thirty-two thousand, two hundred thirty-one".