531687 has 8 divisors (see below), whose sum is σ = 763504. Its totient is φ = 327168.

The previous prime is 531673. The next prime is 531689. The reversal of 531687 is 786135.

531687 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 531687 - 2⁶ = 531623 is a prime.

It is a Duffinian number.

It is a nialpdrome in base 14.

It is a congruent number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 531687.

It is not an unprimeable number, because it can be changed into a prime (531689) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 6778 + ... + 6855.

It is an arithmetic number, because the mean of its divisors is an integer number (95438).

2⁵³¹⁶⁸⁷ is an apocalyptic number.

531687 is a deficient number, since it is larger than the sum of its proper divisors (231817).

531687 is a wasteful number, since it uses less digits than its factorization.

531687 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13649.

The product of its digits is 5040, while the sum is 30.

The square root of 531687 is about 729.1687047591. The cubic root of 531687 is about 81.0124961669.

The spelling of 531687 in words is "five hundred thirty-one thousand, six hundred eighty-seven".