13391549 has 2 divisors, whose sum is σ = 13391550. Its totient is φ = 13391548.

The previous prime is 13391531. The next prime is 13391551. The reversal of 13391549 is 94519331.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 12355225 + 1036324 = 3515^2 + 1018^2 .

It is a cyclic number.

It is not a de Polignac number, because 13391549 - 2⁸ = 13391293 is a prime.

Together with 13391551, 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 (13391509) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6695774 + 6695775.

It is an arithmetic number, because the mean of its divisors is an integer number (6695775).

Almost surely, 2^13391549 is an apocalyptic number.

It is an amenable number.

13391549 is a deficient number, since it is larger than the sum of its proper divisors (1).

13391549 is an equidigital number, since it uses as much as digits as its factorization.

13391549 is an evil number, because the sum of its binary digits is even.

The product of its digits is 14580, while the sum is 35.

The square root of 13391549 is about 3659.4465428532. The cubic root of 13391549 is about 237.4708307667.

The spelling of 13391549 in words is "thirteen million, three hundred ninety-one thousand, five hundred forty-nine".