13231309309 has 2 divisors, whose sum is σ = 13231309310. Its totient is φ = 13231309308.

The previous prime is 13231309303. The next prime is 13231309313. The reversal of 13231309309 is 90390313231.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 7296918084 + 5934391225 = 85422^2 + 77035^2 .

It is a cyclic number.

It is not a de Polignac number, because 13231309309 - 2¹¹ = 13231307261 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (13231309303) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6615654654 + 6615654655.

It is an arithmetic number, because the mean of its divisors is an integer number (6615654655).

Almost surely, 2^13231309309 is an apocalyptic number.

It is an amenable number.

13231309309 is a deficient number, since it is larger than the sum of its proper divisors (1).

13231309309 is an equidigital number, since it uses as much as digits as its factorization.

13231309309 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 13122, while the sum is 34.

The spelling of 13231309309 in words is "thirteen billion, two hundred thirty-one million, three hundred nine thousand, three hundred nine".