12613561 has 2 divisors, whose sum is σ = 12613562. Its totient is φ = 12613560.

The previous prime is 12613553. The next prime is 12613567. The reversal of 12613561 is 16531621.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 9120400 + 3493161 = 3020^2 + 1869^2 .

It is an emirp because it is prime and its reverse (16531621) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 12613561 - 2³ = 12613553 is a prime.

It is a super-2 number, since 2×12613561² = 318203842201442, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (12613567) 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, 6306780 + 6306781.

It is an arithmetic number, because the mean of its divisors is an integer number (6306781).

Almost surely, 2^12613561 is an apocalyptic number.

It is an amenable number.

12613561 is a deficient number, since it is larger than the sum of its proper divisors (1).

12613561 is an equidigital number, since it uses as much as digits as its factorization.

12613561 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1080, while the sum is 25.

The square root of 12613561 is about 3551.5575456411. The cubic root of 12613561 is about 232.7801286853.

The spelling of 12613561 in words is "twelve million, six hundred thirteen thousand, five hundred sixty-one".