538591 has 4 divisors (see below), whose sum is σ = 562032. Its totient is φ = 515152.

The previous prime is 538589. The next prime is 538597. The reversal of 538591 is 195835.

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 538591 - 2¹ = 538589 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (538597) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 11686 + ... + 11731.

It is an arithmetic number, because the mean of its divisors is an integer number (140508).

2⁵³⁸⁵⁹¹ is an apocalyptic number.

538591 is a deficient number, since it is larger than the sum of its proper divisors (23441).

538591 is a wasteful number, since it uses less digits than its factorization.

538591 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 23440.

The product of its digits is 5400, while the sum is 31.

The square root of 538591 is about 733.8875935727. The cubic root of 538591 is about 81.3616406141.

It can be divided in two parts, 5385 and 91, that added together give a square (5476 = 74²).

The spelling of 538591 in words is "five hundred thirty-eight thousand, five hundred ninety-one".