1320961 has 2 divisors, whose sum is σ = 1320962. Its totient is φ = 1320960.

The previous prime is 1320947. The next prime is 1320973. The reversal of 1320961 is 1690231.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1113025 + 207936 = 1055^2 + 456^2 .

It is an emirp because it is prime and its reverse (1690231) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1320961 - 2⁵ = 1320929 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1320901) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (5) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 660480 + 660481.

It is an arithmetic number, because the mean of its divisors is an integer number (660481).

It is a Proth number, since it is equal to 645 ⋅ 2¹¹ + 1 and 645 < 2¹¹.

2^1320961 is an apocalyptic number.

It is an amenable number.

1320961 is a deficient number, since it is larger than the sum of its proper divisors (1).

1320961 is an equidigital number, since it uses as much as digits as its factorization.

1320961 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 324, while the sum is 22.

The square root of 1320961 is about 1149.3306747842. The cubic root of 1320961 is about 109.7227452935.

The spelling of 1320961 in words is "one million, three hundred twenty thousand, nine hundred sixty-one".