13315121 has 2 divisors, whose sum is σ = 13315122. Its totient is φ = 13315120.

The previous prime is 13315117. The next prime is 13315123. The reversal of 13315121 is 12151331.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 11826721 + 1488400 = 3439^2 + 1220^2 .

It is a cyclic number.

It is not a de Polignac number, because 13315121 - 2² = 13315117 is a prime.

It is a Sophie Germain prime.

Together with 13315123, it forms a pair of twin primes.

It is a Chen prime.

It is a Curzon number.

It is a zygodrome in base 7.

It is a self number, because there is not a number n which added to its sum of digits gives 13315121.

It is not a weakly prime, because it can be changed into another prime (13315123) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6657560 + 6657561.

It is an arithmetic number, because the mean of its divisors is an integer number (6657561).

Almost surely, 2^13315121 is an apocalyptic number.

It is an amenable number.

13315121 is a deficient number, since it is larger than the sum of its proper divisors (1).

13315121 is an equidigital number, since it uses as much as digits as its factorization.

13315121 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 90, while the sum is 17.

The square root of 13315121 is about 3648.9890380762. The cubic root of 13315121 is about 237.0182055602.

Adding to 13315121 its reverse (12151331), we get a palindrome (25466452).

The spelling of 13315121 in words is "thirteen million, three hundred fifteen thousand, one hundred twenty-one".