861786522 has 12 divisors (see below), whose sum is σ = 1867204170. Its totient is φ = 287262168.

The previous prime is 861786511. The next prime is 861786529. The reversal of 861786522 is 225687168.

861786522 is a `hidden beast` number, since 8 + 617 + 8 + 6 + 5 + 22 = 666.

It can be written as a sum of positive squares in only one way, i.e., 551357361 + 310429161 = 23481^2 + 17619^2 .

It is not an unprimeable number, because it can be changed into a prime (861786529) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 23938497 + ... + 23938532.

Almost surely, 2^861786522 is an apocalyptic number.

861786522 is an abundant number, since it is smaller than the sum of its proper divisors (1005417648).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

861786522 is a wasteful number, since it uses less digits than its factorization.

861786522 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 47877037 (or 47877034 counting only the distinct ones).

The product of its digits is 322560, while the sum is 45.

The square root of 861786522 is about 29356.2007419216. The cubic root of 861786522 is about 951.6265843888.

The spelling of 861786522 in words is "eight hundred sixty-one million, seven hundred eighty-six thousand, five hundred twenty-two".