13919731487 has 2 divisors, whose sum is σ = 13919731488. Its totient is φ = 13919731486.

The previous prime is 13919731447. The next prime is 13919731499. The reversal of 13919731487 is 78413791931.

It is a strong prime.

It is an emirp because it is prime and its reverse (78413791931) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 13919731487 - 2¹⁰ = 13919730463 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (13919731447) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6959865743 + 6959865744.

It is an arithmetic number, because the mean of its divisors is an integer number (6959865744).

Almost surely, 2^13919731487 is an apocalyptic number.

13919731487 is a deficient number, since it is larger than the sum of its proper divisors (1).

13919731487 is an equidigital number, since it uses as much as digits as its factorization.

13919731487 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1143072, while the sum is 53.

The spelling of 13919731487 in words is "thirteen billion, nine hundred nineteen million, seven hundred thirty-one thousand, four hundred eighty-seven".