1111399687991 has 2 divisors, whose sum is σ = 1111399687992. Its totient is φ = 1111399687990.

The previous prime is 1111399687967. The next prime is 1111399688011. The reversal of 1111399687991 is 1997869931111.

It is a happy number.

It is a strong prime.

It is an emirp because it is prime and its reverse (1997869931111) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1111399687991 - 2¹⁰ = 1111399686967 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1111399687591) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 555699843995 + 555699843996.

It is an arithmetic number, because the mean of its divisors is an integer number (555699843996).

Almost surely, 2^{1111399687991} is an apocalyptic number.

1111399687991 is a deficient number, since it is larger than the sum of its proper divisors (1).

1111399687991 is an equidigital number, since it uses as much as digits as its factorization.

1111399687991 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 6613488, while the sum is 65.

The spelling of 1111399687991 in words is "one trillion, one hundred eleven billion, three hundred ninety-nine million, six hundred eighty-seven thousand, nine hundred ninety-one".