13615513 has 2 divisors, whose sum is σ = 13615514. Its totient is φ = 13615512.

The previous prime is 13615493. The next prime is 13615531. The reversal of 13615513 is 31551631.

Together with next prime (13615531) it forms an Ormiston pair, because they use the same digits, order apart.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 7912969 + 5702544 = 2813^2 + 2388^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-13615513 is a prime.

It is not a weakly prime, because it can be changed into another prime (13615573) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6807756 + 6807757.

It is an arithmetic number, because the mean of its divisors is an integer number (6807757).

Almost surely, 2^13615513 is an apocalyptic number.

It is an amenable number.

13615513 is a deficient number, since it is larger than the sum of its proper divisors (1).

13615513 is an equidigital number, since it uses as much as digits as its factorization.

13615513 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1350, while the sum is 25.

The square root of 13615513 is about 3689.9204598473. The cubic root of 13615513 is about 238.7873612758.

The spelling of 13615513 in words is "thirteen million, six hundred fifteen thousand, five hundred thirteen".