12513661 has 4 divisors (see below), whose sum is σ = 12664512. Its totient is φ = 12362812.

The previous prime is 12513653. The next prime is 12513689. The reversal of 12513661 is 16631521.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 16631521 = 397 ⋅41893.

It is a cyclic number.

It is not a de Polignac number, because 12513661 - 2³ = 12513653 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12513461) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 75301 + ... + 75466.

It is an arithmetic number, because the mean of its divisors is an integer number (3166128).

Almost surely, 2^12513661 is an apocalyptic number.

It is an amenable number.

12513661 is a deficient number, since it is larger than the sum of its proper divisors (150851).

12513661 is an equidigital number, since it uses as much as digits as its factorization.

12513661 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 150850.

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

The square root of 12513661 is about 3537.4653355192. The cubic root of 12513661 is about 232.1639558936.

The spelling of 12513661 in words is "twelve million, five hundred thirteen thousand, six hundred sixty-one".