13447891 has 2 divisors, whose sum is σ = 13447892. Its totient is φ = 13447890.

The previous prime is 13447883. The next prime is 13447919. The reversal of 13447891 is 19874431.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 13447891 - 2³ = 13447883 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 13447891.

It is not a weakly prime, because it can be changed into another prime (13447871) 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, 6723945 + 6723946.

It is an arithmetic number, because the mean of its divisors is an integer number (6723946).

Almost surely, 2^13447891 is an apocalyptic number.

13447891 is a deficient number, since it is larger than the sum of its proper divisors (1).

13447891 is an equidigital number, since it uses as much as digits as its factorization.

13447891 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 24192, while the sum is 37.

The square root of 13447891 is about 3667.1366213982. The cubic root of 13447891 is about 237.8034002451.

The spelling of 13447891 in words is "thirteen million, four hundred forty-seven thousand, eight hundred ninety-one".