531439 has 4 divisors (see below), whose sum is σ = 536256. Its totient is φ = 526624.

The previous prime is 531383. The next prime is 531457. The reversal of 531439 is 934135.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 531439 - 2¹⁹ = 7151 is a prime.

It is a Duffinian number.

It is a nialpdrome in base 3 and base 9.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (531239) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2239 + ... + 2464.

It is an arithmetic number, because the mean of its divisors is an integer number (134064).

531439 is a Friedman number, since it can be written as (9*3)^4-5+3*1, using all its digits and the basic arithmetic operations.

2⁵³¹⁴³⁹ is an apocalyptic number.

531439 is a deficient number, since it is larger than the sum of its proper divisors (4817).

531439 is a wasteful number, since it uses less digits than its factorization.

531439 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4816.

The product of its digits is 1620, while the sum is 25.

The square root of 531439 is about 728.9986282566. The cubic root of 531439 is about 80.9998983893. Note that the first 3 decimals are identical.

It can be divided in two parts, 53 and 1439, that multiplied together give a palindrome (76267).

The spelling of 531439 in words is "five hundred thirty-one thousand, four hundred thirty-nine".