531359989 has 2 divisors, whose sum is σ = 531359990. Its totient is φ = 531359988.

The previous prime is 531359981. The next prime is 531360001. The reversal of 531359989 is 989953135.

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., 518700625 + 12659364 = 22775^2 + 3558^2 .

It is a cyclic number.

It is not a de Polignac number, because 531359989 - 2³ = 531359981 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (531359981) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 265679994 + 265679995.

It is an arithmetic number, because the mean of its divisors is an integer number (265679995).

Almost surely, 2^531359989 is an apocalyptic number.

It is an amenable number.

531359989 is a deficient number, since it is larger than the sum of its proper divisors (1).

531359989 is an equidigital number, since it uses as much as digits as its factorization.

531359989 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1312200, while the sum is 52.

The square root of 531359989 is about 23051.2470161595. The cubic root of 531359989 is about 809.9588400565.

The spelling of 531359989 in words is "five hundred thirty-one million, three hundred fifty-nine thousand, nine hundred eighty-nine".