531389 has 4 divisors (see below), whose sum is σ = 532860. Its totient is φ = 529920.

The previous prime is 531383. The next prime is 531457. The reversal of 531389 is 983135.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in 2 ways, for example, as 403225 + 128164 = 635^2 + 358^2 .

It is a cyclic number.

It is not a de Polignac number, because 531389 - 2⁸ = 531133 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a nialpdrome in base 9.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (531383) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 227 + ... + 1055.

It is an arithmetic number, because the mean of its divisors is an integer number (133215).

2⁵³¹³⁸⁹ is an apocalyptic number.

It is an amenable number.

531389 is a deficient number, since it is larger than the sum of its proper divisors (1471).

531389 is an equidigital number, since it uses as much as digits as its factorization.

531389 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1470.

The product of its digits is 3240, while the sum is 29.

The square root of 531389 is about 728.9643338326. The cubic root of 531389 is about 80.9973580401.

The spelling of 531389 in words is "five hundred thirty-one thousand, three hundred eighty-nine".