12697661 has 4 divisors (see below), whose sum is σ = 12967872. Its totient is φ = 12427452.

The previous prime is 12697651. The next prime is 12697669. The reversal of 12697661 is 16679621.

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: 16679621 = 7 ⋅2382803.

It is a cyclic number.

It is not a de Polignac number, because 12697661 - 2²² = 8503357 is a prime.

It is a super-2 number, since 2×12697661² = 322461189741842, which contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12697669) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 135035 + ... + 135128.

It is an arithmetic number, because the mean of its divisors is an integer number (3241968).

Almost surely, 2^12697661 is an apocalyptic number.

It is an amenable number.

12697661 is a deficient number, since it is larger than the sum of its proper divisors (270211).

12697661 is an equidigital number, since it uses as much as digits as its factorization.

12697661 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 270210.

The product of its digits is 27216, while the sum is 38.

The square root of 12697661 is about 3563.3777515161. The cubic root of 12697661 is about 233.2963313207.

The spelling of 12697661 in words is "twelve million, six hundred ninety-seven thousand, six hundred sixty-one".