531265543 has 2 divisors, whose sum is σ = 531265544. Its totient is φ = 531265542.

The previous prime is 531265519. The next prime is 531265561. The reversal of 531265543 is 345562135.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-531265543 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 531265499 and 531265508.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (531265513) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 265632771 + 265632772.

It is an arithmetic number, because the mean of its divisors is an integer number (265632772).

Almost surely, 2^531265543 is an apocalyptic number.

531265543 is a deficient number, since it is larger than the sum of its proper divisors (1).

531265543 is an equidigital number, since it uses as much as digits as its factorization.

531265543 is an evil number, because the sum of its binary digits is even.

The product of its digits is 54000, while the sum is 34.

The square root of 531265543 is about 23049.1983157766. The cubic root of 531265543 is about 809.9108487970.

The spelling of 531265543 in words is "five hundred thirty-one million, two hundred sixty-five thousand, five hundred forty-three".