2105443987 has 2 divisors, whose sum is σ = 2105443988. Its totient is φ = 2105443986.

The previous prime is 2105443961. The next prime is 2105444023. The reversal of 2105443987 is 7893445012.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 2105443987 - 2⁷ = 2105443859 is a prime.

It is not a weakly prime, because it can be changed into another prime (2105543987) 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, 1052721993 + 1052721994.

It is an arithmetic number, because the mean of its divisors is an integer number (1052721994).

Almost surely, 2^2105443987 is an apocalyptic number.

2105443987 is a deficient number, since it is larger than the sum of its proper divisors (1).

2105443987 is an equidigital number, since it uses as much as digits as its factorization.

2105443987 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 241920, while the sum is 43.

The square root of 2105443987 is about 45885.1172712896. The cubic root of 2105443987 is about 1281.6847905079.

Adding to 2105443987 its reverse (7893445012), we get a palindrome (9998888999).

The spelling of 2105443987 in words is "two billion, one hundred five million, four hundred forty-three thousand, nine hundred eighty-seven".