12687133 has 4 divisors (see below), whose sum is σ = 12957120. Its totient is φ = 12417148.

The previous prime is 12687119. The next prime is 12687149. The reversal of 12687133 is 33178621.

12687133 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, 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: 33178621 = 7 ⋅4739803.

It is a cyclic number.

It is not a de Polignac number, because 12687133 - 2²¹ = 10589981 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 12687095 and 12687104.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12687113) 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, 134923 + ... + 135016.

It is an arithmetic number, because the mean of its divisors is an integer number (3239280).

Almost surely, 2^12687133 is an apocalyptic number.

It is an amenable number.

12687133 is a deficient number, since it is larger than the sum of its proper divisors (269987).

12687133 is an equidigital number, since it uses as much as digits as its factorization.

12687133 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 269986.

The product of its digits is 6048, while the sum is 31.

The square root of 12687133 is about 3561.9001951206. The cubic root of 12687133 is about 233.2318359015.

The spelling of 12687133 in words is "twelve million, six hundred eighty-seven thousand, one hundred thirty-three".