531647 has 4 divisors (see below), whose sum is σ = 544656. Its totient is φ = 518640.

The previous prime is 531637. The next prime is 531667. The reversal of 531647 is 746135.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 531647 - 2⁴ = 531631 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (531637) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6443 + ... + 6524.

It is an arithmetic number, because the mean of its divisors is an integer number (136164).

2⁵³¹⁶⁴⁷ is an apocalyptic number.

531647 is a deficient number, since it is larger than the sum of its proper divisors (13009).

531647 is a wasteful number, since it uses less digits than its factorization.

531647 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13008.

The product of its digits is 2520, while the sum is 26.

The square root of 531647 is about 729.1412757484. The cubic root of 531647 is about 81.0104645323.

The spelling of 531647 in words is "five hundred thirty-one thousand, six hundred forty-seven".