861885243 has 6 divisors (see below), whose sum is σ = 1244945364. Its totient is φ = 574590156.

The previous prime is 861885169. The next prime is 861885263. The reversal of 861885243 is 342588168.

861885243 is a `hidden beast` number, since 8 + 618 + 8 + 5 + 24 + 3 = 666.

It is not a de Polignac number, because 861885243 - 2¹⁷ = 861754171 is a prime.

It is not an unprimeable number, because it can be changed into a prime (861885263) 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 in 5 ways as a sum of consecutive naturals, for example, 47882505 + ... + 47882522.

It is an arithmetic number, because the mean of its divisors is an integer number (207490894).

Almost surely, 2^861885243 is an apocalyptic number.

861885243 is a deficient number, since it is larger than the sum of its proper divisors (383060121).

861885243 is a wasteful number, since it uses less digits than its factorization.

861885243 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 95765033 (or 95765030 counting only the distinct ones).

The product of its digits is 368640, while the sum is 45.

The square root of 861885243 is about 29357.8821272925. The cubic root of 861885243 is about 951.6629205109.

The spelling of 861885243 in words is "eight hundred sixty-one million, eight hundred eighty-five thousand, two hundred forty-three".