1320732709 has 2 divisors, whose sum is σ = 1320732710. Its totient is φ = 1320732708.

The previous prime is 1320732653. The next prime is 1320732739. The reversal of 1320732709 is 9072370231.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1025408484 + 295324225 = 32022^2 + 17185^2 .

It is a cyclic number.

It is not a de Polignac number, because 1320732709 - 2²³ = 1312344101 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1320732739) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 660366354 + 660366355.

It is an arithmetic number, because the mean of its divisors is an integer number (660366355).

Almost surely, 2^1320732709 is an apocalyptic number.

It is an amenable number.

1320732709 is a deficient number, since it is larger than the sum of its proper divisors (1).

1320732709 is an equidigital number, since it uses as much as digits as its factorization.

1320732709 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 15876, while the sum is 34.

The square root of 1320732709 is about 36341.8864259961. The cubic root of 1320732709 is about 1097.1642409800.

The spelling of 1320732709 in words is "one billion, three hundred twenty million, seven hundred thirty-two thousand, seven hundred nine".