531539 has 4 divisors (see below), whose sum is σ = 562824. Its totient is φ = 500256.

The previous prime is 531521. The next prime is 531547. The reversal of 531539 is 935135.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 935135 = 5 ⋅187027.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-531539 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (531569) 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, 15617 + ... + 15650.

It is an arithmetic number, because the mean of its divisors is an integer number (140706).

2⁵³¹⁵³⁹ is an apocalyptic number.

531539 is a deficient number, since it is larger than the sum of its proper divisors (31285).

531539 is a wasteful number, since it uses less digits than its factorization.

531539 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 31284.

The product of its digits is 2025, while the sum is 26.

The square root of 531539 is about 729.0672122651. The cubic root of 531539 is about 81.0049786098.

The spelling of 531539 in words is "five hundred thirty-one thousand, five hundred thirty-nine".