1005861889 has 2 divisors, whose sum is σ = 1005861890. Its totient is φ = 1005861888.

The previous prime is 1005861863. The next prime is 1005861907. The reversal of 1005861889 is 9881685001.

1005861889 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 967521025 + 38340864 = 31105^2 + 6192^2 .

It is a cyclic number.

It is not a de Polignac number, because 1005861889 - 2¹⁹ = 1005337601 is a prime.

It is not a weakly prime, because it can be changed into another prime (1005861589) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 502930944 + 502930945.

It is an arithmetic number, because the mean of its divisors is an integer number (502930945).

Almost surely, 2^1005861889 is an apocalyptic number.

It is an amenable number.

1005861889 is a deficient number, since it is larger than the sum of its proper divisors (1).

1005861889 is an equidigital number, since it uses as much as digits as its factorization.

1005861889 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 138240, while the sum is 46.

The square root of 1005861889 is about 31715.3257747733. The cubic root of 1005861889 is about 1001.9501574138.

The spelling of 1005861889 in words is "one billion, five million, eight hundred sixty-one thousand, eight hundred eighty-nine".