1320311310209 has 2 divisors, whose sum is σ = 1320311310210. Its totient is φ = 1320311310208.

The previous prime is 1320311310169. The next prime is 1320311310233. The reversal of 1320311310209 is 9020131130231.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1218588586609 + 101722723600 = 1103897^2 + 318940^2 .

It is a cyclic number.

It is not a de Polignac number, because 1320311310209 - 2¹² = 1320311306113 is a prime.

It is not a weakly prime, because it can be changed into another prime (1320311310809) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 660155655104 + 660155655105.

It is an arithmetic number, because the mean of its divisors is an integer number (660155655105).

Almost surely, 2^{1320311310209} is an apocalyptic number.

It is an amenable number.

1320311310209 is a deficient number, since it is larger than the sum of its proper divisors (1).

1320311310209 is an equidigital number, since it uses as much as digits as its factorization.

1320311310209 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 972, while the sum is 26.

The spelling of 1320311310209 in words is "one trillion, three hundred twenty billion, three hundred eleven million, three hundred ten thousand, two hundred nine".