1304561 has 4 divisors (see below), whose sum is σ = 1307124. Its totient is φ = 1302000.

The previous prime is 1304551. The next prime is 1304581. The reversal of 1304561 is 1654031.

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

It can be written as a sum of positive squares in 2 ways, for example, as 430336 + 874225 = 656^2 + 935^2 .

It is a cyclic number.

It is not a de Polignac number, because 1304561 - 2¹⁰ = 1303537 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1304531) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 230 + ... + 1631.

It is an arithmetic number, because the mean of its divisors is an integer number (326781).

2^1304561 is an apocalyptic number.

It is an amenable number.

1304561 is a deficient number, since it is larger than the sum of its proper divisors (2563).

1304561 is an equidigital number, since it uses as much as digits as its factorization.

1304561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2562.

The product of its (nonzero) digits is 360, while the sum is 20.

The square root of 1304561 is about 1142.1738046375. The cubic root of 1304561 is about 109.2667763250.

Adding to 1304561 its reverse (1654031), we get a palindrome (2958592).

The spelling of 1304561 in words is "one million, three hundred four thousand, five hundred sixty-one".