531639 has 12 divisors (see below), whose sum is σ = 808600. Its totient is φ = 335664.

The previous prime is 531637. The next prime is 531667. The reversal of 531639 is 936135.

531639 = T₂₂₇ + T₂₂₈ + ... + T₂₄₅.

531639 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 531639 - 2¹ = 531637 is a prime.

It is a d-powerful number, because it can be written as 5³ + 3³ + 6² + 1 + 3¹² + 9 .

It is a Duffinian number.

It is a plaindrome in base 11.

It is a nialpdrome in base 14.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (531631) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1384 + ... + 1725.

531639 is a Friedman number, since it can be written as 9^(5+1)+33*6, using all its digits and the basic arithmetic operations.

2⁵³¹⁶³⁹ is an apocalyptic number.

531639 is a deficient number, since it is larger than the sum of its proper divisors (276961).

531639 is a wasteful number, since it uses less digits than its factorization.

531639 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3134 (or 3131 counting only the distinct ones).

The product of its digits is 2430, while the sum is 27.

The square root of 531639 is about 729.1357898224. The cubic root of 531639 is about 81.0100581931.

Subtracting 531639 from its reverse (936135), we obtain a square (404496 = 636²).

The spelling of 531639 in words is "five hundred thirty-one thousand, six hundred thirty-nine".