1320605311 has 2 divisors, whose sum is σ = 1320605312. Its totient is φ = 1320605310.

The previous prime is 1320605269. The next prime is 1320605347. The reversal of 1320605311 is 1135060231.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 1320605311 - 2²⁵ = 1287050879 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1320605371) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 660302655 + 660302656.

It is an arithmetic number, because the mean of its divisors is an integer number (660302656).

Almost surely, 2^1320605311 is an apocalyptic number.

1320605311 is a deficient number, since it is larger than the sum of its proper divisors (1).

1320605311 is an equidigital number, since it uses as much as digits as its factorization.

1320605311 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 540, while the sum is 22.

The square root of 1320605311 is about 36340.1336128529. The cubic root of 1320605311 is about 1097.1289623241.

Adding to 1320605311 its reverse (1135060231), we get a palindrome (2455665542).

The spelling of 1320605311 in words is "one billion, three hundred twenty million, six hundred five thousand, three hundred eleven".