13136561 has 2 divisors, whose sum is σ = 13136562. Its totient is φ = 13136560.

The previous prime is 13136537. The next prime is 13136567. The reversal of 13136561 is 16563131.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 10764961 + 2371600 = 3281^2 + 1540^2 .

It is a cyclic number.

It is not a de Polignac number, because 13136561 - 2¹⁸ = 12874417 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 13136561.

It is not a weakly prime, because it can be changed into another prime (13136567) 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, 6568280 + 6568281.

It is an arithmetic number, because the mean of its divisors is an integer number (6568281).

Almost surely, 2^13136561 is an apocalyptic number.

It is an amenable number.

13136561 is a deficient number, since it is larger than the sum of its proper divisors (1).

13136561 is an equidigital number, since it uses as much as digits as its factorization.

13136561 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1620, while the sum is 26.

The square root of 13136561 is about 3624.4394049287. The cubic root of 13136561 is about 235.9539374335.

Adding to 13136561 its reverse (16563131), we get a palindrome (29699692).

The spelling of 13136561 in words is "thirteen million, one hundred thirty-six thousand, five hundred sixty-one".