12661535 has 4 divisors (see below), whose sum is σ = 15193848. Its totient is φ = 10129224.

The previous prime is 12661499. The next prime is 12661589. The reversal of 12661535 is 53516621.

12661535 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 12661535 - 2²⁰ = 11612959 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 12661498 and 12661507.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1266149 + ... + 1266158.

It is an arithmetic number, because the mean of its divisors is an integer number (3798462).

Almost surely, 2^12661535 is an apocalyptic number.

12661535 is a deficient number, since it is larger than the sum of its proper divisors (2532313).

12661535 is an equidigital number, since it uses as much as digits as its factorization.

12661535 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2532312.

The product of its digits is 5400, while the sum is 29.

The square root of 12661535 is about 3558.3050740486. The cubic root of 12661535 is about 233.0748714054.

The spelling of 12661535 in words is "twelve million, six hundred sixty-one thousand, five hundred thirty-five".