538631 has 4 divisors (see below), whose sum is σ = 567000. Its totient is φ = 510264.

The previous prime is 538621. The next prime is 538649. The reversal of 538631 is 136835.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 136835 = 5 ⋅27367.

It is not a de Polignac number, because 538631 - 2⁶ = 538567 is a prime.

It is a super-2 number, since 2×538631² = 580246708322, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 538631.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (538621) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 14156 + ... + 14193.

It is an arithmetic number, because the mean of its divisors is an integer number (141750).

2⁵³⁸⁶³¹ is an apocalyptic number.

538631 is a deficient number, since it is larger than the sum of its proper divisors (28369).

538631 is a wasteful number, since it uses less digits than its factorization.

538631 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 28368.

The product of its digits is 2160, while the sum is 26.

The square root of 538631 is about 733.9148451966. The cubic root of 538631 is about 81.3636547492.

The spelling of 538631 in words is "five hundred thirty-eight thousand, six hundred thirty-one".