111556987 has 2 divisors, whose sum is σ = 111556988. Its totient is φ = 111556986.

The previous prime is 111556967. The next prime is 111557011. The reversal of 111556987 is 789655111.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 111556987 - 2²³ = 103168379 is a prime.

It is a super-4 number, since 4×111556987⁴ (a number of 33 digits) contains 4444 as substring. Note that it is a super-d number also for d = 2.

It is not a weakly prime, because it can be changed into another prime (111556957) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 55778493 + 55778494.

It is an arithmetic number, because the mean of its divisors is an integer number (55778494).

Almost surely, 2^111556987 is an apocalyptic number.

111556987 is a deficient number, since it is larger than the sum of its proper divisors (1).

111556987 is an equidigital number, since it uses as much as digits as its factorization.

111556987 is an evil number, because the sum of its binary digits is even.

The product of its digits is 75600, while the sum is 43.

The square root of 111556987 is about 10562.0541089317. The cubic root of 111556987 is about 481.3920628102.

The spelling of 111556987 in words is "one hundred eleven million, five hundred fifty-six thousand, nine hundred eighty-seven".