6531564 has 48 divisors (see below), whose sum is σ = 16581600. Its totient is φ = 1989120.

The previous prime is 6531557. The next prime is 6531593. The reversal of 6531564 is 4651356.

It is a super-2 number, since 2×6531564² = 85322656572192, which contains 22 as substring.

It is an Ulam number.

Its product of digits (10800) is a multiple of the sum of its prime factors (450).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 23104 + ... + 23384.

It is an arithmetic number, because the mean of its divisors is an integer number (345450).

Almost surely, 2^6531564 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 6531564, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (8290800).

6531564 is an abundant number, since it is smaller than the sum of its proper divisors (10050036).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

6531564 is a wasteful number, since it uses less digits than its factorization.

6531564 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 450 (or 448 counting only the distinct ones).

The product of its digits is 10800, while the sum is 30.

The square root of 6531564 is about 2555.6924697624. The cubic root of 6531564 is about 186.9271547512.

The spelling of 6531564 in words is "six million, five hundred thirty-one thousand, five hundred sixty-four".