1320811 has 2 divisors, whose sum is σ = 1320812. Its totient is φ = 1320810.

The previous prime is 1320799. The next prime is 1320859. The reversal of 1320811 is 1180231.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 1320811 - 2¹⁵ = 1288043 is a prime.

It is not a weakly prime, because it can be changed into another prime (1320871) 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 as a sum of consecutive naturals, namely, 660405 + 660406.

It is an arithmetic number, because the mean of its divisors is an integer number (660406).

2^1320811 is an apocalyptic number.

1320811 is a deficient number, since it is larger than the sum of its proper divisors (1).

1320811 is an equidigital number, since it uses as much as digits as its factorization.

1320811 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 48, while the sum is 16.

The square root of 1320811 is about 1149.2654175603. The cubic root of 1320811 is about 109.7185919954.

The spelling of 1320811 in words is "one million, three hundred twenty thousand, eight hundred eleven".