111387815593 has 2 divisors, whose sum is σ = 111387815594. Its totient is φ = 111387815592.

The previous prime is 111387815563. The next prime is 111387815597. The reversal of 111387815593 is 395518783111.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 108786509584 + 2601306009 = 329828^2 + 51003^2 .

It is a cyclic number.

It is not a de Polignac number, because 111387815593 - 2¹⁷ = 111387684521 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 111387815593.

It is not a weakly prime, because it can be changed into another prime (111387815597) 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, 55693907796 + 55693907797.

It is an arithmetic number, because the mean of its divisors is an integer number (55693907797).

Almost surely, 2^111387815593 is an apocalyptic number.

It is an amenable number.

111387815593 is a deficient number, since it is larger than the sum of its proper divisors (1).

111387815593 is an equidigital number, since it uses as much as digits as its factorization.

111387815593 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 907200, while the sum is 52.

The spelling of 111387815593 in words is "one hundred eleven billion, three hundred eighty-seven million, eight hundred fifteen thousand, five hundred ninety-three".