13449409 has 2 divisors, whose sum is σ = 13449410. Its totient is φ = 13449408.

The previous prime is 13449391. The next prime is 13449421. The reversal of 13449409 is 90494431.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 13249600 + 199809 = 3640^2 + 447^2 .

It is an emirp because it is prime and its reverse (90494431) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 13449409 - 2⁷ = 13449281 is a prime.

It is not a weakly prime, because it can be changed into another prime (13449209) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6724704 + 6724705.

It is an arithmetic number, because the mean of its divisors is an integer number (6724705).

Almost surely, 2^13449409 is an apocalyptic number.

It is an amenable number.

13449409 is a deficient number, since it is larger than the sum of its proper divisors (1).

13449409 is an equidigital number, since it uses as much as digits as its factorization.

13449409 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 15552, while the sum is 34.

The square root of 13449409 is about 3667.3435890301. The cubic root of 13449409 is about 237.8123476699.

The spelling of 13449409 in words is "thirteen million, four hundred forty-nine thousand, four hundred nine".