1566541 has 6 divisors (see below), whose sum is σ = 1596426. Its totient is φ = 1537200.

The previous prime is 1566529. The next prime is 1566559. The reversal of 1566541 is 1456651.

It can be written as a sum of positive squares in 3 ways, for example, as 455625 + 1110916 = 675^2 + 1054^2 .

It is a de Polignac number, because none of the positive numbers 2^k-1566541 is a prime.

It is an Ulam number.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1566571) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 3511 + ... + 3931.

It is an arithmetic number, because the mean of its divisors is an integer number (266071).

2^1566541 is an apocalyptic number.

It is an amenable number.

1566541 is a deficient number, since it is larger than the sum of its proper divisors (29885).

1566541 is an frugal number, since it uses more digits than its factorization.

1566541 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 543 (or 482 counting only the distinct ones).

The product of its digits is 3600, while the sum is 28.

The square root of 1566541 is about 1251.6153562497. The cubic root of 1566541 is about 116.1396702479.

The spelling of 1566541 in words is "one million, five hundred sixty-six thousand, five hundred forty-one".