1323561 has 4 divisors (see below), whose sum is σ = 1764752. Its totient is φ = 882372.

The previous prime is 1323551. The next prime is 1323571. The reversal of 1323561 is 1653231.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is an interprime number because it is at equal distance from previous prime (1323551) and next prime (1323571).

It is not a de Polignac number, because 1323561 - 2⁵ = 1323529 is a prime.

It is a D-number.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1323541) 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, 220591 + ... + 220596.

It is an arithmetic number, because the mean of its divisors is an integer number (441188).

2^1323561 is an apocalyptic number.

It is an amenable number.

1323561 is a deficient number, since it is larger than the sum of its proper divisors (441191).

1323561 is an equidigital number, since it uses as much as digits as its factorization.

1323561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 441190.

The product of its digits is 540, while the sum is 21.

The square root of 1323561 is about 1150.4612118624. The cubic root of 1323561 is about 109.7946858918.

Adding to 1323561 its reverse (1653231), we get a palindrome (2976792).

The spelling of 1323561 in words is "one million, three hundred twenty-three thousand, five hundred sixty-one".