12681123001 has 4 divisors (see below), whose sum is σ = 12681693412. Its totient is φ = 12680552592.

The previous prime is 12681122989. The next prime is 12681123017. The reversal of 12681123001 is 10032118621.

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 4032123001 + 8649000000 = 63499^2 + 93000^2 .

It is a cyclic number.

It is not a de Polignac number, because 12681123001 - 2¹⁹ = 12680598713 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (12681123041) 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, 250446 + ... + 296791.

It is an arithmetic number, because the mean of its divisors is an integer number (3170423353).

Almost surely, 2^12681123001 is an apocalyptic number.

It is an amenable number.

12681123001 is a deficient number, since it is larger than the sum of its proper divisors (570411).

12681123001 is an equidigital number, since it uses as much as digits as its factorization.

12681123001 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 570410.

The product of its (nonzero) digits is 576, while the sum is 25.

The spelling of 12681123001 in words is "twelve billion, six hundred eighty-one million, one hundred twenty-three thousand, one".