13691387 has 2 divisors, whose sum is σ = 13691388. Its totient is φ = 13691386.

The previous prime is 13691351. The next prime is 13691401. The reversal of 13691387 is 78319631.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 13691387 - 2⁶ = 13691323 is a prime.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 13691387.

It is not a weakly prime, because it can be changed into another prime (13691347) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6845693 + 6845694.

It is an arithmetic number, because the mean of its divisors is an integer number (6845694).

Almost surely, 2^13691387 is an apocalyptic number.

13691387 is a deficient number, since it is larger than the sum of its proper divisors (1).

13691387 is an equidigital number, since it uses as much as digits as its factorization.

13691387 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 27216, while the sum is 38.

The square root of 13691387 is about 3700.1874276853. The cubic root of 13691387 is about 239.2300965009.

The spelling of 13691387 in words is "thirteen million, six hundred ninety-one thousand, three hundred eighty-seven".