1330561 has 4 divisors (see below), whose sum is σ = 1336324. Its totient is φ = 1324800.

The previous prime is 1330559. The next prime is 1330577. The reversal of 1330561 is 1650331.

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 690561 + 640000 = 831^2 + 800^2 .

It is a cyclic number.

It is not a de Polignac number, because 1330561 - 2¹ = 1330559 is a prime.

It is a Duffinian number.

1330561 is a lucky number.

It is not an unprimeable number, because it can be changed into a prime (1330501) 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, 2520 + ... + 3001.

It is an arithmetic number, because the mean of its divisors is an integer number (334081).

2^1330561 is an apocalyptic number.

It is an amenable number.

1330561 is a deficient number, since it is larger than the sum of its proper divisors (5763).

1330561 is an equidigital number, since it uses as much as digits as its factorization.

1330561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5762.

The product of its (nonzero) digits is 270, while the sum is 19.

The square root of 1330561 is about 1153.4994581707. The cubic root of 1330561 is about 109.9879050062.

Adding to 1330561 its reverse (1650331), we get a palindrome (2980892).

It can be divided in two parts, 13305 and 61, that added together give a triangular number (13366 = T₁₆₃).

The spelling of 1330561 in words is "one million, three hundred thirty thousand, five hundred sixty-one".