561315431 has 2 divisors, whose sum is σ = 561315432. Its totient is φ = 561315430.

The previous prime is 561315413. The next prime is 561315451. The reversal of 561315431 is 134513165.

Together with previous prime (561315413) it forms an Ormiston pair, because they use the same digits, order apart.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 561315431 - 2¹⁸ = 561053287 is a prime.

It is a super-2 number, since 2×561315431² = 630150026157431522, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 561315394 and 561315403.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (561315451) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 280657715 + 280657716.

It is an arithmetic number, because the mean of its divisors is an integer number (280657716).

Almost surely, 2^561315431 is an apocalyptic number.

561315431 is a deficient number, since it is larger than the sum of its proper divisors (1).

561315431 is an equidigital number, since it uses as much as digits as its factorization.

561315431 is an evil number, because the sum of its binary digits is even.

The product of its digits is 5400, while the sum is 29.

The square root of 561315431 is about 23692.0963825492. The cubic root of 561315431 is about 824.9019441464.

Adding to 561315431 its reverse (134513165), we get a palindrome (695828596).

The spelling of 561315431 in words is "five hundred sixty-one million, three hundred fifteen thousand, four hundred thirty-one".