861013589 has 2 divisors, whose sum is σ = 861013590. Its totient is φ = 861013588.

The previous prime is 861013577. The next prime is 861013649. The reversal of 861013589 is 985310168.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 658179025 + 202834564 = 25655^2 + 14242^2 .

It is a cyclic number.

It is not a de Polignac number, because 861013589 - 2¹² = 861009493 is a prime.

It is a Sophie Germain prime.

It is a Chen prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (861013889) 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, 430506794 + 430506795.

It is an arithmetic number, because the mean of its divisors is an integer number (430506795).

Almost surely, 2^861013589 is an apocalyptic number.

It is an amenable number.

861013589 is a deficient number, since it is larger than the sum of its proper divisors (1).

861013589 is an equidigital number, since it uses as much as digits as its factorization.

861013589 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 51840, while the sum is 41.

The square root of 861013589 is about 29343.0330572693. The cubic root of 861013589 is about 951.3419958882.

The spelling of 861013589 in words is "eight hundred sixty-one million, thirteen thousand, five hundred eighty-nine".