12565043431 has 2 divisors, whose sum is σ = 12565043432. Its totient is φ = 12565043430.

The previous prime is 12565043401. The next prime is 12565043479. The reversal of 12565043431 is 13434056521.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 12565043431 - 2⁷ = 12565043303 is a prime.

It is a super-2 number, since 2×12565043431² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (12565043401) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6282521715 + 6282521716.

It is an arithmetic number, because the mean of its divisors is an integer number (6282521716).

Almost surely, 2^12565043431 is an apocalyptic number.

12565043431 is a deficient number, since it is larger than the sum of its proper divisors (1).

12565043431 is an equidigital number, since it uses as much as digits as its factorization.

12565043431 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 43200, while the sum is 34.

Adding to 12565043431 its reverse (13434056521), we get a palindrome (25999099952).

The spelling of 12565043431 in words is "twelve billion, five hundred sixty-five million, forty-three thousand, four hundred thirty-one".