12681005 has 4 divisors (see below), whose sum is σ = 15217212. Its totient is φ = 10144800.

The previous prime is 12680977. The next prime is 12681007. The reversal of 12681005 is 50018621.

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

It can be written as a sum of positive squares in 2 ways, for example, as 3108169 + 9572836 = 1763^2 + 3094^2 .

It is not a de Polignac number, because 12681005 - 2⁸ = 12680749 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12681007) 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, 1268096 + ... + 1268105.

It is an arithmetic number, because the mean of its divisors is an integer number (3804303).

Almost surely, 2^12681005 is an apocalyptic number.

It is an amenable number.

12681005 is a deficient number, since it is larger than the sum of its proper divisors (2536207).

12681005 is an equidigital number, since it uses as much as digits as its factorization.

12681005 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2536206.

The product of its (nonzero) digits is 480, while the sum is 23.

The square root of 12681005 is about 3561.0398762159. The cubic root of 12681005 is about 233.1942788252.

Adding to 12681005 its reverse (50018621), we get a palindrome (62699626).

The spelling of 12681005 in words is "twelve million, six hundred eighty-one thousand, five".