531245432009 has 2 divisors, whose sum is σ = 531245432010. Its totient is φ = 531245432008.

The previous prime is 531245431993. The next prime is 531245432099. The reversal of 531245432009 is 900234542135.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 411111792400 + 120133639609 = 641180^2 + 346603^2 .

It is a cyclic number.

It is not a de Polignac number, because 531245432009 - 2⁴ = 531245431993 is a prime.

It is not a weakly prime, because it can be changed into another prime (531245432099) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 265622716004 + 265622716005.

It is an arithmetic number, because the mean of its divisors is an integer number (265622716005).

Almost surely, 2^531245432009 is an apocalyptic number.

It is an amenable number.

531245432009 is a deficient number, since it is larger than the sum of its proper divisors (1).

531245432009 is an equidigital number, since it uses as much as digits as its factorization.

531245432009 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 129600, while the sum is 38.

The spelling of 531245432009 in words is "five hundred thirty-one billion, two hundred forty-five million, four hundred thirty-two thousand, nine".