13115513 has 2 divisors, whose sum is σ = 13115514. Its totient is φ = 13115512.

The previous prime is 13115489. The next prime is 13115527. The reversal of 13115513 is 31551131.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 9320809 + 3794704 = 3053^2 + 1948^2 .

It is a cyclic number.

It is not a de Polignac number, because 13115513 - 2⁸ = 13115257 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (13115533) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6557756 + 6557757.

It is an arithmetic number, because the mean of its divisors is an integer number (6557757).

Almost surely, 2^13115513 is an apocalyptic number.

It is an amenable number.

13115513 is a deficient number, since it is larger than the sum of its proper divisors (1).

13115513 is an equidigital number, since it uses as much as digits as its factorization.

13115513 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 225, while the sum is 20.

The square root of 13115513 is about 3621.5346194673. The cubic root of 13115513 is about 235.8278513323.

Adding to 13115513 its reverse (31551131), we get a palindrome (44666644).

The spelling of 13115513 in words is "thirteen million, one hundred fifteen thousand, five hundred thirteen".