111115987 has 2 divisors, whose sum is σ = 111115988. Its totient is φ = 111115986.

The previous prime is 111115937. The next prime is 111116011. The reversal of 111115987 is 789511111.

It is a strong prime.

It is an emirp because it is prime and its reverse (789511111) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 111115987 - 2¹⁹ = 110591699 is a prime.

It is equal to p_6363457 and since 111115987 and 6363457 have the same sum of digits, it is a Honaker prime.

It is not a weakly prime, because it can be changed into another prime (111115937) 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, 55557993 + 55557994.

It is an arithmetic number, because the mean of its divisors is an integer number (55557994).

Almost surely, 2^111115987 is an apocalyptic number.

111115987 is a deficient number, since it is larger than the sum of its proper divisors (1).

111115987 is an equidigital number, since it uses as much as digits as its factorization.

111115987 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 2520, while the sum is 34.

The square root of 111115987 is about 10541.1568150749. The cubic root of 111115987 is about 480.7568889149.

The spelling of 111115987 in words is "one hundred eleven million, one hundred fifteen thousand, nine hundred eighty-seven".