13111409 has 2 divisors, whose sum is σ = 13111410. Its totient is φ = 13111408.

The previous prime is 13111379. The next prime is 13111411. The reversal of 13111409 is 90411131.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 9394225 + 3717184 = 3065^2 + 1928^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-13111409 is a prime.

Together with 13111411, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (13111429) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6555704 + 6555705.

It is an arithmetic number, because the mean of its divisors is an integer number (6555705).

Almost surely, 2^13111409 is an apocalyptic number.

It is an amenable number.

13111409 is a deficient number, since it is larger than the sum of its proper divisors (1).

13111409 is an equidigital number, since it uses as much as digits as its factorization.

13111409 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 108, while the sum is 20.

The square root of 13111409 is about 3620.9679645089. The cubic root of 13111409 is about 235.8032509864.

The spelling of 13111409 in words is "thirteen million, one hundred eleven thousand, four hundred nine".