531504009 has 12 divisors (see below), whose sum is σ = 772882500. Its totient is φ = 351957024.

The previous prime is 531503971. The next prime is 531504011. The reversal of 531504009 is 900405135.

It can be written as a sum of positive squares in 2 ways, for example, as 35462025 + 496041984 = 5955^2 + 22272^2 .

It is not a de Polignac number, because 531504009 - 2¹¹ = 531501961 is a prime.

It is not an unprimeable number, because it can be changed into a prime (531504049) 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 in 11 ways as a sum of consecutive naturals, for example, 196834 + ... + 199515.

It is an arithmetic number, because the mean of its divisors is an integer number (64406875).

Almost surely, 2^531504009 is an apocalyptic number.

It is an amenable number.

531504009 is a deficient number, since it is larger than the sum of its proper divisors (241378491).

531504009 is a wasteful number, since it uses less digits than its factorization.

531504009 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 396504 (or 396501 counting only the distinct ones).

The product of its (nonzero) digits is 2700, while the sum is 27.

The square root of 531504009 is about 23054.3707135979. The cubic root of 531504009 is about 810.0320106234.

The spelling of 531504009 in words is "five hundred thirty-one million, five hundred four thousand, nine".