12813187 has 4 divisors (see below), whose sum is σ = 13085856. Its totient is φ = 12540520.

The previous prime is 12813181. The next prime is 12813217. The reversal of 12813187 is 78131821.

It is a happy number.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-12813187 is a prime.

It is a super-2 number, since 2×12813187² = 328355522193938, which contains 22 as substring.

It is a Smith number, since the sum of its digits (31) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is a zygodrome in base 2.

It is not an unprimeable number, because it can be changed into a prime (12813181) 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, 136264 + ... + 136357.

It is an arithmetic number, because the mean of its divisors is an integer number (3271464).

Almost surely, 2^12813187 is an apocalyptic number.

12813187 is a deficient number, since it is larger than the sum of its proper divisors (272669).

12813187 is an equidigital number, since it uses as much as digits as its factorization.

12813187 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 272668.

The product of its digits is 2688, while the sum is 31.

The square root of 12813187 is about 3579.5512288554. The cubic root of 12813187 is about 234.0017227818.

The spelling of 12813187 in words is "twelve million, eight hundred thirteen thousand, one hundred eighty-seven".