2111129987 has 2 divisors, whose sum is σ = 2111129988. Its totient is φ = 2111129986.

The previous prime is 2111129981. The next prime is 2111130011. The reversal of 2111129987 is 7899211112.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 2111129987 - 2¹⁰ = 2111128963 is a prime.

It is not a weakly prime, because it can be changed into another prime (2111129981) 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, 1055564993 + 1055564994.

It is an arithmetic number, because the mean of its divisors is an integer number (1055564994).

Almost surely, 2^2111129987 is an apocalyptic number.

2111129987 is a deficient number, since it is larger than the sum of its proper divisors (1).

2111129987 is an equidigital number, since it uses as much as digits as its factorization.

2111129987 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 18144, while the sum is 41.

The square root of 2111129987 is about 45947.0345833112. The cubic root of 2111129987 is about 1282.8375337763.

The spelling of 2111129987 in words is "two billion, one hundred eleven million, one hundred twenty-nine thousand, nine hundred eighty-seven".