1320191 has 2 divisors, whose sum is σ = 1320192. Its totient is φ = 1320190.

The previous prime is 1320181. The next prime is 1320199. The reversal of 1320191 is 1910231.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 1320191 - 2⁶ = 1320127 is a prime.

It is a Sophie Germain prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1320199) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 660095 + 660096.

It is an arithmetic number, because the mean of its divisors is an integer number (660096).

2^1320191 is an apocalyptic number.

1320191 is a deficient number, since it is larger than the sum of its proper divisors (1).

1320191 is an equidigital number, since it uses as much as digits as its factorization.

1320191 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 54, while the sum is 17.

The square root of 1320191 is about 1148.9956483817. The cubic root of 1320191 is about 109.7014216927.

The spelling of 1320191 in words is "one million, three hundred twenty thousand, one hundred ninety-one".