1566241 has 4 divisors (see below), whose sum is σ = 1604484. Its totient is φ = 1528000.

The previous prime is 1566239. The next prime is 1566251. The reversal of 1566241 is 1426651.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 1426651 = 31 ⋅46021.

It can be written as a sum of positive squares in 2 ways, for example, as 291600 + 1274641 = 540^2 + 1129^2 .

It is a cyclic number.

It is not a de Polignac number, because 1566241 - 2¹ = 1566239 is a prime.

It is a super-2 number, since 2×1566241² = 4906221740162, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1566211) 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, 19060 + ... + 19141.

It is an arithmetic number, because the mean of its divisors is an integer number (401121).

2^1566241 is an apocalyptic number.

It is an amenable number.

1566241 is a deficient number, since it is larger than the sum of its proper divisors (38243).

1566241 is an equidigital number, since it uses as much as digits as its factorization.

1566241 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 38242.

The product of its digits is 1440, while the sum is 25.

The square root of 1566241 is about 1251.4955053855. The cubic root of 1566241 is about 116.1322560095.

The spelling of 1566241 in words is "one million, five hundred sixty-six thousand, two hundred forty-one".