1320091 has 2 divisors, whose sum is σ = 1320092. Its totient is φ = 1320090.

The previous prime is 1320061. The next prime is 1320107. The reversal of 1320091 is 1900231.

It is an a-pointer prime, because the next prime (1320107) can be obtained adding 1320091 to its sum of digits (16).

It is a strong prime.

It is an emirp because it is prime and its reverse (1900231) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1320091 - 2⁷ = 1319963 is a prime.

1320091 is a lucky number.

It is not a weakly prime, because it can be changed into another prime (1320031) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 660045 + 660046.

It is an arithmetic number, because the mean of its divisors is an integer number (660046).

2^1320091 is an apocalyptic number.

1320091 is a deficient number, since it is larger than the sum of its proper divisors (1).

1320091 is an equidigital number, since it uses as much as digits as its factorization.

1320091 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 54, while the sum is 16.

The square root of 1320091 is about 1148.9521312918. The cubic root of 1320091 is about 109.6986517857.

The spelling of 1320091 in words is "one million, three hundred twenty thousand, ninety-one".