12640051 has 4 divisors (see below), whose sum is σ = 12981712. Its totient is φ = 12298392.

The previous prime is 12640037. The next prime is 12640091. The reversal of 12640051 is 15004621.

12640051 is digitally balanced in base 3, 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 an emirpimes, since its reverse is a distinct semiprime: 15004621 = 1571 ⋅9551.

It is a cyclic number.

It is not a de Polignac number, because 12640051 - 2⁷ = 12639923 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (12640021) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 170775 + ... + 170848.

It is an arithmetic number, because the mean of its divisors is an integer number (3245428).

Almost surely, 2^12640051 is an apocalyptic number.

12640051 is a deficient number, since it is larger than the sum of its proper divisors (341661).

12640051 is an equidigital number, since it uses as much as digits as its factorization.

12640051 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 341660.

The product of its (nonzero) digits is 240, while the sum is 19.

The square root of 12640051 is about 3555.2849393544. The cubic root of 12640051 is about 232.9429701951.

Adding to 12640051 its reverse (15004621), we get a palindrome (27644672).

The spelling of 12640051 in words is "twelve million, six hundred forty thousand, fifty-one".