501539 has 4 divisors (see below), whose sum is σ = 511056. Its totient is φ = 492024.

The previous prime is 501511. The next prime is 501563. The reversal of 501539 is 935105.

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 501539 - 2¹⁶ = 436003 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (501139) 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, 4679 + ... + 4784.

It is an arithmetic number, because the mean of its divisors is an integer number (127764).

2⁵⁰¹⁵³⁹ is an apocalyptic number.

501539 is a deficient number, since it is larger than the sum of its proper divisors (9517).

501539 is an equidigital number, since it uses as much as digits as its factorization.

501539 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9516.

The product of its (nonzero) digits is 675, while the sum is 23.

The square root of 501539 is about 708.1941824104. The cubic root of 501539 is about 79.4514028640.

The spelling of 501539 in words is "five hundred one thousand, five hundred thirty-nine".