1320881 has 2 divisors, whose sum is σ = 1320882. Its totient is φ = 1320880.

The previous prime is 1320871. The next prime is 1320887. The reversal of 1320881 is 1880231.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1221025 + 99856 = 1105^2 + 316^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1320881 is a prime.

It is a super-2 number, since 2×1320881² = 3489453232322, which contains 22 as substring.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (1320887) by changing a digit.

It is a good prime.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 660440 + 660441.

It is an arithmetic number, because the mean of its divisors is an integer number (660441).

2^1320881 is an apocalyptic number.

It is an amenable number.

1320881 is a deficient number, since it is larger than the sum of its proper divisors (1).

1320881 is an equidigital number, since it uses as much as digits as its factorization.

1320881 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 384, while the sum is 23.

The square root of 1320881 is about 1149.2958713926. The cubic root of 1320881 is about 109.7205302403.

The spelling of 1320881 in words is "one million, three hundred twenty thousand, eight hundred eighty-one".