531489509 has 2 divisors, whose sum is σ = 531489510. Its totient is φ = 531489508.

The previous prime is 531489499. The next prime is 531489521. The reversal of 531489509 is 905984135.

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., 268238884 + 263250625 = 16378^2 + 16225^2 .

It is a cyclic number.

It is not a de Polignac number, because 531489509 - 2⁸ = 531489253 is a prime.

It is a super-2 number, since 2×531489509² = 564962196354122162, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 531489509.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (531489709) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 265744754 + 265744755.

It is an arithmetic number, because the mean of its divisors is an integer number (265744755).

Almost surely, 2^531489509 is an apocalyptic number.

It is an amenable number.

531489509 is a deficient number, since it is larger than the sum of its proper divisors (1).

531489509 is an equidigital number, since it uses as much as digits as its factorization.

531489509 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 194400, while the sum is 44.

The square root of 531489509 is about 23054.0562374607. The cubic root of 531489509 is about 810.0246443754.

The spelling of 531489509 in words is "five hundred thirty-one million, four hundred eighty-nine thousand, five hundred nine".