13191887 has 2 divisors, whose sum is σ = 13191888. Its totient is φ = 13191886.

The previous prime is 13191883. The next prime is 13191901. The reversal of 13191887 is 78819131.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 13191887 - 2² = 13191883 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 13191887.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (13191883) 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, 6595943 + 6595944.

It is an arithmetic number, because the mean of its divisors is an integer number (6595944).

Almost surely, 2^13191887 is an apocalyptic number.

13191887 is a deficient number, since it is larger than the sum of its proper divisors (1).

13191887 is an equidigital number, since it uses as much as digits as its factorization.

13191887 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 12096, while the sum is 38.

The square root of 13191887 is about 3632.0637384275. The cubic root of 13191887 is about 236.2847217147.

The spelling of 13191887 in words is "thirteen million, one hundred ninety-one thousand, eight hundred eighty-seven".