561431 has 8 divisors (see below), whose sum is σ = 636720. Its totient is φ = 490752.

The previous prime is 561419. The next prime is 561439. The reversal of 561431 is 134165.

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 561431 - 2⁶ = 561367 is a prime.

It is a super-2 number, since 2×561431² = 630409535522, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 561431.

It is not an unprimeable number, because it can be changed into a prime (561439) 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, 890 + ... + 1383.

It is an arithmetic number, because the mean of its divisors is an integer number (79590).

2⁵⁶¹⁴³¹ is an apocalyptic number.

561431 is a deficient number, since it is larger than the sum of its proper divisors (75289).

561431 is a wasteful number, since it uses less digits than its factorization.

561431 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2305.

The product of its digits is 360, while the sum is 20.

The square root of 561431 is about 749.2869944154. The cubic root of 561431 is about 82.4958553167.

Adding to 561431 its reverse (134165), we get a palindrome (695596).

The spelling of 561431 in words is "five hundred sixty-one thousand, four hundred thirty-one".