539521 has 4 divisors (see below), whose sum is σ = 552112. Its totient is φ = 526932.

The previous prime is 539509. The next prime is 539533. The reversal of 539521 is 125935.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is an interprime number because it is at equal distance from previous prime (539509) and next prime (539533).

It is a cyclic number.

It is not a de Polignac number, because 539521 - 2⁹ = 539009 is a prime.

It is an Ulam number.

It is a Duffinian number.

539521 is a lucky number.

It is not an unprimeable number, because it can be changed into a prime (539501) 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, 6231 + ... + 6316.

It is an arithmetic number, because the mean of its divisors is an integer number (138028).

2⁵³⁹⁵²¹ is an apocalyptic number.

It is an amenable number.

539521 is a deficient number, since it is larger than the sum of its proper divisors (12591).

539521 is a wasteful number, since it uses less digits than its factorization.

539521 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12590.

The product of its digits is 1350, while the sum is 25.

The square root of 539521 is about 734.5209323089. The cubic root of 539521 is about 81.4084434854.

The spelling of 539521 in words is "five hundred thirty-nine thousand, five hundred twenty-one".