1320749509 has 2 divisors, whose sum is σ = 1320749510. Its totient is φ = 1320749508.

The previous prime is 1320749501. The next prime is 1320749543. The reversal of 1320749509 is 9059470231.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1009332900 + 311416609 = 31770^2 + 17647^2 .

It is a cyclic number.

It is not a de Polignac number, because 1320749509 - 2³ = 1320749501 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1320749501) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 660374754 + 660374755.

It is an arithmetic number, because the mean of its divisors is an integer number (660374755).

Almost surely, 2^1320749509 is an apocalyptic number.

It is an amenable number.

1320749509 is a deficient number, since it is larger than the sum of its proper divisors (1).

1320749509 is an equidigital number, since it uses as much as digits as its factorization.

1320749509 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 68040, while the sum is 40.

The square root of 1320749509 is about 36342.1175635102. The cubic root of 1320749509 is about 1097.1688930142.

The spelling of 1320749509 in words is "one billion, three hundred twenty million, seven hundred forty-nine thousand, five hundred nine".