13278791 has 2 divisors, whose sum is σ = 13278792. Its totient is φ = 13278790.

The previous prime is 13278737. The next prime is 13278799. The reversal of 13278791 is 19787231.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-13278791 is a prime.

It is equal to p₈₆₆₁₈₉ and since 13278791 and 866189 have the same sum of digits, it is a Honaker prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (13278799) 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 as a sum of consecutive naturals, namely, 6639395 + 6639396.

It is an arithmetic number, because the mean of its divisors is an integer number (6639396).

Almost surely, 2^13278791 is an apocalyptic number.

13278791 is a deficient number, since it is larger than the sum of its proper divisors (1).

13278791 is an equidigital number, since it uses as much as digits as its factorization.

13278791 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 21168, while the sum is 38.

The square root of 13278791 is about 3644.0075466442. The cubic root of 13278791 is about 236.8024429742.

The spelling of 13278791 in words is "thirteen million, two hundred seventy-eight thousand, seven hundred ninety-one".