1320716389 has 2 divisors, whose sum is σ = 1320716390. Its totient is φ = 1320716388.

The previous prime is 1320716387. The next prime is 1320716393. The reversal of 1320716389 is 9836170231.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 918393025 + 402323364 = 30305^2 + 20058^2 .

It is a cyclic number.

It is not a de Polignac number, because 1320716389 - 2¹ = 1320716387 is a prime.

Together with 1320716387, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1320716387) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 660358194 + 660358195.

It is an arithmetic number, because the mean of its divisors is an integer number (660358195).

Almost surely, 2^1320716389 is an apocalyptic number.

It is an amenable number.

1320716389 is a deficient number, since it is larger than the sum of its proper divisors (1).

1320716389 is an equidigital number, since it uses as much as digits as its factorization.

1320716389 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 54432, while the sum is 40.

The square root of 1320716389 is about 36341.6618910033. The cubic root of 1320716389 is about 1097.1597218233.

The spelling of 1320716389 in words is "one billion, three hundred twenty million, seven hundred sixteen thousand, three hundred eighty-nine".