531891 has 12 divisors (see below), whose sum is σ = 776568. Its totient is φ = 350784.

The previous prime is 531877. The next prime is 531901. The reversal of 531891 is 198135.

531891 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 531891 - 2⁶ = 531827 is a prime.

It is a plaindrome in base 11.

It is a nialpdrome in base 14.

It is not an unprimeable number, because it can be changed into a prime (531821) 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, 756 + ... + 1278.

It is an arithmetic number, because the mean of its divisors is an integer number (64714).

2⁵³¹⁸⁹¹ is an apocalyptic number.

531891 is a deficient number, since it is larger than the sum of its proper divisors (244677).

531891 is a wasteful number, since it uses less digits than its factorization.

It is an anagram of its base 13 representation: 531891 = (158139)₁₃.

531891 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 642 (or 639 counting only the distinct ones).

The product of its digits is 1080, while the sum is 27.

The square root of 531891 is about 729.3085766670. The cubic root of 531891 is about 81.0228559186.

The spelling of 531891 in words is "five hundred thirty-one thousand, eight hundred ninety-one".