1309391329 has 2 divisors, whose sum is σ = 1309391330. Its totient is φ = 1309391328.

The previous prime is 1309391287. The next prime is 1309391333. The reversal of 1309391329 is 9231939031.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 726410304 + 582981025 = 26952^2 + 24145^2 .

It is a cyclic number.

It is not a de Polignac number, because 1309391329 - 2¹³ = 1309383137 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 1309391291 and 1309391300.

It is not a weakly prime, because it can be changed into another prime (1309391339) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 654695664 + 654695665.

It is an arithmetic number, because the mean of its divisors is an integer number (654695665).

Almost surely, 2^1309391329 is an apocalyptic number.

It is an amenable number.

1309391329 is a deficient number, since it is larger than the sum of its proper divisors (1).

1309391329 is an equidigital number, since it uses as much as digits as its factorization.

1309391329 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 39366, while the sum is 40.

The square root of 1309391329 is about 36185.5126949999. The cubic root of 1309391329 is about 1094.0146899246.

The spelling of 1309391329 in words is "one billion, three hundred nine million, three hundred ninety-one thousand, three hundred twenty-nine".