13378991 has 2 divisors, whose sum is σ = 13378992. Its totient is φ = 13378990.

The previous prime is 13378961. The next prime is 13378993. The reversal of 13378991 is 19987331.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 13378991 - 2⁶ = 13378927 is a prime.

Together with 13378993, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (13378993) 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, 6689495 + 6689496.

It is an arithmetic number, because the mean of its divisors is an integer number (6689496).

Almost surely, 2^13378991 is an apocalyptic number.

13378991 is a deficient number, since it is larger than the sum of its proper divisors (1).

13378991 is an equidigital number, since it uses as much as digits as its factorization.

13378991 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 40824, while the sum is 41.

The square root of 13378991 is about 3657.7303071714. The cubic root of 13378991 is about 237.3965776847.

The spelling of 13378991 in words is "thirteen million, three hundred seventy-eight thousand, nine hundred ninety-one".