531556009 has 2 divisors, whose sum is σ = 531556010. Its totient is φ = 531556008.

The previous prime is 531555923. The next prime is 531556063. The reversal of 531556009 is 900655135.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 530611225 + 944784 = 23035^2 + 972^2 .

It is a cyclic number.

It is not a de Polignac number, because 531556009 - 2¹¹ = 531553961 is a prime.

It is not a weakly prime, because it can be changed into another prime (531556079) 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, 265778004 + 265778005.

It is an arithmetic number, because the mean of its divisors is an integer number (265778005).

Almost surely, 2^531556009 is an apocalyptic number.

It is an amenable number.

531556009 is a deficient number, since it is larger than the sum of its proper divisors (1).

531556009 is an equidigital number, since it uses as much as digits as its factorization.

531556009 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 20250, while the sum is 34.

The square root of 531556009 is about 23055.4984548155. The cubic root of 531556009 is about 810.0584264109.

The spelling of 531556009 in words is "five hundred thirty-one million, five hundred fifty-six thousand, nine".