531656 has 8 divisors (see below), whose sum is σ = 996870. Its totient is φ = 265824.

The previous prime is 531637. The next prime is 531667. The reversal of 531656 is 656135.

It can be written as a sum of positive squares in only one way, i.e., 504100 + 27556 = 710^2 + 166^2 .

It is a tau number, because it is divible by the number of its divisors (8).

It is a nialpdrome in base 14.

It is an unprimeable number.

531656 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33221 + ... + 33236.

2⁵³¹⁶⁵⁶ is an apocalyptic number.

It is an amenable number.

531656 is a deficient number, since it is larger than the sum of its proper divisors (465214).

531656 is a wasteful number, since it uses less digits than its factorization.

531656 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 66463 (or 66459 counting only the distinct ones).

The product of its digits is 2700, while the sum is 26.

The square root of 531656 is about 729.1474473658. The cubic root of 531656 is about 81.0109216589.

The spelling of 531656 in words is "five hundred thirty-one thousand, six hundred fifty-six".