12811685 has 4 divisors (see below), whose sum is σ = 15374028. Its totient is φ = 10249344.

The previous prime is 12811679. The next prime is 12811691. The reversal of 12811685 is 58611821.

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

It is an interprime number because it is at equal distance from previous prime (12811679) and next prime (12811691).

It can be written as a sum of positive squares in 2 ways, for example, as 1934881 + 10876804 = 1391^2 + 3298^2 .

It is a cyclic number.

It is not a de Polignac number, because 12811685 - 2²² = 8617381 is a prime.

It is a Duffinian number.

It is a Curzon number.

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, 1281164 + ... + 1281173.

It is an arithmetic number, because the mean of its divisors is an integer number (3843507).

Almost surely, 2^12811685 is an apocalyptic number.

It is an amenable number.

12811685 is a deficient number, since it is larger than the sum of its proper divisors (2562343).

12811685 is an equidigital number, since it uses as much as digits as its factorization.

12811685 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2562342.

The product of its digits is 3840, while the sum is 32.

The square root of 12811685 is about 3579.3414198704. The cubic root of 12811685 is about 233.9925789645.

The spelling of 12811685 in words is "twelve million, eight hundred eleven thousand, six hundred eighty-five".