13391639 has 2 divisors, whose sum is σ = 13391640. Its totient is φ = 13391638.

The previous prime is 13391621. The next prime is 13391641. The reversal of 13391639 is 93619331.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 13391639 - 2²⁰ = 12343063 is a prime.

Together with 13391641, it forms a pair of twin primes.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 13391599 and 13391608.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (13391689) 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, 6695819 + 6695820.

It is an arithmetic number, because the mean of its divisors is an integer number (6695820).

Almost surely, 2^13391639 is an apocalyptic number.

13391639 is a deficient number, since it is larger than the sum of its proper divisors (1).

13391639 is an equidigital number, since it uses as much as digits as its factorization.

13391639 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 13122, while the sum is 35.

The square root of 13391639 is about 3659.4588397740. The cubic root of 13391639 is about 237.4713627521.

The spelling of 13391639 in words is "thirteen million, three hundred ninety-one thousand, six hundred thirty-nine".