1320399169 has 2 divisors, whose sum is σ = 1320399170. Its totient is φ = 1320399168.

The previous prime is 1320399133. The next prime is 1320399181. The reversal of 1320399169 is 9619930231.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1311308944 + 9090225 = 36212^2 + 3015^2 .

It is a cyclic number.

It is not a de Polignac number, because 1320399169 - 2¹³ = 1320390977 is a prime.

It is a super-2 number, since 2×1320399169² = 3486907930991781122, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (1320399869) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 660199584 + 660199585.

It is an arithmetic number, because the mean of its divisors is an integer number (660199585).

Almost surely, 2^1320399169 is an apocalyptic number.

It is an amenable number.

1320399169 is a deficient number, since it is larger than the sum of its proper divisors (1).

1320399169 is an equidigital number, since it uses as much as digits as its factorization.

1320399169 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 78732, while the sum is 43.

The square root of 1320399169 is about 36337.2972164964. The cubic root of 1320399169 is about 1097.0718733196.

The spelling of 1320399169 in words is "one billion, three hundred twenty million, three hundred ninety-nine thousand, one hundred sixty-nine".