531989 has 2 divisors, whose sum is σ = 531990. Its totient is φ = 531988.

The previous prime is 531983. The next prime is 531997. The reversal of 531989 is 989135.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 504100 + 27889 = 710^2 + 167^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-531989 is a prime.

It is a super-2 number, since 2×531989² = 566024592242, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (531983) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 265994 + 265995.

It is an arithmetic number, because the mean of its divisors is an integer number (265995).

2⁵³¹⁹⁸⁹ is an apocalyptic number.

It is an amenable number.

531989 is a deficient number, since it is larger than the sum of its proper divisors (1).

531989 is an equidigital number, since it uses as much as digits as its factorization.

531989 is an evil number, because the sum of its binary digits is even.

The product of its digits is 9720, while the sum is 35.

The square root of 531989 is about 729.3757604966. The cubic root of 531989 is about 81.0278317202.

The spelling of 531989 in words is "five hundred thirty-one thousand, nine hundred eighty-nine".