2011987 has 2 divisors, whose sum is σ = 2011988. Its totient is φ = 2011986.

The previous prime is 2011973. The next prime is 2012009. The reversal of 2011987 is 7891102.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-2011987 is a prime.

It is not a weakly prime, because it can be changed into another prime (2011907) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1005993 + 1005994.

It is an arithmetic number, because the mean of its divisors is an integer number (1005994).

2^2011987 is an apocalyptic number.

2011987 is a deficient number, since it is larger than the sum of its proper divisors (1).

2011987 is an equidigital number, since it uses as much as digits as its factorization.

2011987 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1008, while the sum is 28.

The square root of 2011987 is about 1418.4452756451. The cubic root of 2011987 is about 126.2433150073.

The spelling of 2011987 in words is "two million, eleven thousand, nine hundred eighty-seven".