531987 has 8 divisors (see below), whose sum is σ = 712704. Its totient is φ = 352968.

The previous prime is 531983. The next prime is 531989. The reversal of 531987 is 789135.

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

It is not a de Polignac number, because 531987 - 2² = 531983 is a prime.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 531987.

It is not an unprimeable number, because it can be changed into a prime (531983) 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, 918 + ... + 1380.

It is an arithmetic number, because the mean of its divisors is an integer number (89088).

2⁵³¹⁹⁸⁷ is an apocalyptic number.

531987 is a deficient number, since it is larger than the sum of its proper divisors (180717).

531987 is a wasteful number, since it uses less digits than its factorization.

531987 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 849.

The product of its digits is 7560, while the sum is 33.

The square root of 531987 is about 729.3743894599. The cubic root of 531987 is about 81.0277301794.

Multiplying 531987 by its sum of digits (33), we get a palindrome (17555571).

The spelling of 531987 in words is "five hundred thirty-one thousand, nine hundred eighty-seven".