12643451 has 4 divisors (see below), whose sum is σ = 12657672. Its totient is φ = 12629232.

The previous prime is 12643447. The next prime is 12643453. The reversal of 12643451 is 15434621.

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

It is a cyclic number.

It is not a de Polignac number, because 12643451 - 2² = 12643447 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 12643451.

It is not an unprimeable number, because it can be changed into a prime (12643453) 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, 5681 + ... + 7586.

It is an arithmetic number, because the mean of its divisors is an integer number (3164418).

Almost surely, 2^12643451 is an apocalyptic number.

12643451 is a deficient number, since it is larger than the sum of its proper divisors (14221).

12643451 is an equidigital number, since it uses as much as digits as its factorization.

12643451 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14220.

The product of its digits is 2880, while the sum is 26.

The square root of 12643451 is about 3555.7630685972. The cubic root of 12643451 is about 232.9638544752.

The spelling of 12643451 in words is "twelve million, six hundred forty-three thousand, four hundred fifty-one".