111681612587 has 2 divisors, whose sum is σ = 111681612588. Its totient is φ = 111681612586.

The previous prime is 111681612569. The next prime is 111681612593. The reversal of 111681612587 is 785216186111.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 111681612587 - 2⁸ = 111681612331 is a prime.

It is not a weakly prime, because it can be changed into another prime (111681692587) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 55840806293 + 55840806294.

It is an arithmetic number, because the mean of its divisors is an integer number (55840806294).

Almost surely, 2^111681612587 is an apocalyptic number.

111681612587 is a deficient number, since it is larger than the sum of its proper divisors (1).

111681612587 is an equidigital number, since it uses as much as digits as its factorization.

111681612587 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 161280, while the sum is 47.

Adding to 111681612587 its reverse (785216186111), we get a palindrome (896897798698).

The spelling of 111681612587 in words is "one hundred eleven billion, six hundred eighty-one million, six hundred twelve thousand, five hundred eighty-seven".