12778451 has 4 divisors (see below), whose sum is σ = 14603952. Its totient is φ = 10952952.

The previous prime is 12778433. The next prime is 12778453. The reversal of 12778451 is 15487721.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-12778451 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (12778453) 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, 912740 + ... + 912753.

It is an arithmetic number, because the mean of its divisors is an integer number (3650988).

Almost surely, 2^12778451 is an apocalyptic number.

12778451 is a deficient number, since it is larger than the sum of its proper divisors (1825501).

12778451 is an equidigital number, since it uses as much as digits as its factorization.

12778451 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1825500.

The product of its digits is 15680, while the sum is 35.

The square root of 12778451 is about 3574.6959311248. The cubic root of 12778451 is about 233.7900752016.

The spelling of 12778451 in words is "twelve million, seven hundred seventy-eight thousand, four hundred fifty-one".