2105039987 has 2 divisors, whose sum is σ = 2105039988. Its totient is φ = 2105039986.

The previous prime is 2105039957. The next prime is 2105040013. The reversal of 2105039987 is 7899305012.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-2105039987 is a prime.

It is not a weakly prime, because it can be changed into another prime (2105039947) 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, 1052519993 + 1052519994.

It is an arithmetic number, because the mean of its divisors is an integer number (1052519994).

Almost surely, 2^2105039987 is an apocalyptic number.

2105039987 is a deficient number, since it is larger than the sum of its proper divisors (1).

2105039987 is an equidigital number, since it uses as much as digits as its factorization.

2105039987 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 136080, while the sum is 44.

The square root of 2105039987 is about 45880.7147612153. The cubic root of 2105039987 is about 1281.6028072016.

The spelling of 2105039987 in words is "two billion, one hundred five million, thirty-nine thousand, nine hundred eighty-seven".