13235121115409 has 2 divisors, whose sum is σ = 13235121115410. Its totient is φ = 13235121115408.

The previous prime is 13235121115351. The next prime is 13235121115493. The reversal of 13235121115409 is 90451112153231.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 13161861573184 + 73259542225 = 3627928^2 + 270665^2 .

It is an emirp because it is prime and its reverse (90451112153231) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 13235121115409 - 2²⁸ = 13234852679953 is a prime.

It is not a weakly prime, because it can be changed into another prime (13235121115309) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6617560557704 + 6617560557705.

It is an arithmetic number, because the mean of its divisors is an integer number (6617560557705).

Almost surely, 2^{13235121115409} is an apocalyptic number.

It is an amenable number.

13235121115409 is a deficient number, since it is larger than the sum of its proper divisors (1).

13235121115409 is an equidigital number, since it uses as much as digits as its factorization.

13235121115409 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 32400, while the sum is 38.

The spelling of 13235121115409 in words is "thirteen trillion, two hundred thirty-five billion, one hundred twenty-one million, one hundred fifteen thousand, four hundred nine".