1111220111987 has 2 divisors, whose sum is σ = 1111220111988. Its totient is φ = 1111220111986.

The previous prime is 1111220111959. The next prime is 1111220112103. The reversal of 1111220111987 is 7891110221111.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 1111220111987 - 2¹⁶ = 1111220046451 is a prime.

It is a super-3 number, since 3×1111220111987³ (a number of 37 digits) contains 333 as substring.

It is not a weakly prime, because it can be changed into another prime (1111220111087) 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, 555610055993 + 555610055994.

It is an arithmetic number, because the mean of its divisors is an integer number (555610055994).

Almost surely, 2^{1111220111987} is an apocalyptic number.

1111220111987 is a deficient number, since it is larger than the sum of its proper divisors (1).

1111220111987 is an equidigital number, since it uses as much as digits as its factorization.

1111220111987 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2016, while the sum is 35.

The spelling of 1111220111987 in words is "one trillion, one hundred eleven billion, two hundred twenty million, one hundred eleven thousand, nine hundred eighty-seven".