13111111121987 has 2 divisors, whose sum is σ = 13111111121988. Its totient is φ = 13111111121986.

The previous prime is 13111111121929. The next prime is 13111111122061. The reversal of 13111111121987 is 78912111111131.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 13111111121987 - 2¹⁸ = 13111110859843 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 13111111121987.

It is not a weakly prime, because it can be changed into another prime (13111111121587) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6555555560993 + 6555555560994.

It is an arithmetic number, because the mean of its divisors is an integer number (6555555560994).

Almost surely, 2^{13111111121987} is an apocalyptic number.

13111111121987 is a deficient number, since it is larger than the sum of its proper divisors (1).

13111111121987 is an equidigital number, since it uses as much as digits as its factorization.

13111111121987 is an evil number, because the sum of its binary digits is even.

The product of its digits is 3024, while the sum is 38.

The spelling of 13111111121987 in words is "thirteen trillion, one hundred eleven billion, one hundred eleven million, one hundred twenty-one thousand, nine hundred eighty-seven".