531445513 has 2 divisors, whose sum is σ = 531445514. Its totient is φ = 531445512.

The previous prime is 531445487. The next prime is 531445531. The reversal of 531445513 is 315544135.

Together with next prime (531445531) it forms an Ormiston pair, because they use the same digits, order apart.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 486996624 + 44448889 = 22068^2 + 6667^2 .

It is a cyclic number.

It is not a de Polignac number, because 531445513 - 2⁹ = 531445001 is a prime.

It is not a weakly prime, because it can be changed into another prime (531445553) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 265722756 + 265722757.

It is an arithmetic number, because the mean of its divisors is an integer number (265722757).

Almost surely, 2^531445513 is an apocalyptic number.

It is an amenable number.

531445513 is a deficient number, since it is larger than the sum of its proper divisors (1).

531445513 is an equidigital number, since it uses as much as digits as its factorization.

531445513 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 18000, while the sum is 31.

The square root of 531445513 is about 23053.1020255409. The cubic root of 531445513 is about 810.0022928350.

Adding to 531445513 its reverse (315544135), we get a palindrome (846989648).

The spelling of 531445513 in words is "five hundred thirty-one million, four hundred forty-five thousand, five hundred thirteen".