1326561 has 24 divisors (see below), whose sum is σ = 2026080. Its totient is φ = 767232.

The previous prime is 1326551. The next prime is 1326587. The reversal of 1326561 is 1656231.

It is not a de Polignac number, because 1326561 - 2⁵ = 1326529 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1326511) 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 23 ways as a sum of consecutive naturals, for example, 35835 + ... + 35871.

It is an arithmetic number, because the mean of its divisors is an integer number (84420).

2^1326561 is an apocalyptic number.

It is an amenable number.

1326561 is a deficient number, since it is larger than the sum of its proper divisors (699519).

1326561 is a wasteful number, since it uses less digits than its factorization.

1326561 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 113 (or 76 counting only the distinct ones).

The product of its digits is 1080, while the sum is 24.

The square root of 1326561 is about 1151.7642988042. The cubic root of 1326561 is about 109.8775773008.

The spelling of 1326561 in words is "one million, three hundred twenty-six thousand, five hundred sixty-one".