13278641 has 4 divisors (see below), whose sum is σ = 13288512. Its totient is φ = 13268772.

The previous prime is 13278637. The next prime is 13278667. The reversal of 13278641 is 14687231.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also a brilliant number, because the two primes have the same length, and also an emirpimes, since its reverse is a distinct semiprime: 14687231 = 13 ⋅1129787.

It is a cyclic number.

It is not a de Polignac number, because 13278641 - 2² = 13278637 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 13278598 and 13278607.

It is not an unprimeable number, because it can be changed into a prime (13278611) 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, 2525 + ... + 5738.

It is an arithmetic number, because the mean of its divisors is an integer number (3322128).

Almost surely, 2^13278641 is an apocalyptic number.

It is an amenable number.

13278641 is a deficient number, since it is larger than the sum of its proper divisors (9871).

13278641 is an equidigital number, since it uses as much as digits as its factorization.

13278641 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9870.

The product of its digits is 8064, while the sum is 32.

The square root of 13278641 is about 3643.9869648505. The cubic root of 13278641 is about 236.8015513142.

The spelling of 13278641 in words is "thirteen million, two hundred seventy-eight thousand, six hundred forty-one".