861055506 has 12 divisors (see below), whose sum is σ = 1865620302. Its totient is φ = 287018496.

The previous prime is 861055493. The next prime is 861055511. The reversal of 861055506 is 605550168.

It can be written as a sum of positive squares in only one way, i.e., 837581481 + 23474025 = 28941^2 + 4845^2 .

It is an unprimeable number.

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 in 5 ways as a sum of consecutive naturals, for example, 23918191 + ... + 23918226.

Almost surely, 2^861055506 is an apocalyptic number.

861055506 is an abundant number, since it is smaller than the sum of its proper divisors (1004564796).

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

861055506 is a wasteful number, since it uses less digits than its factorization.

861055506 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 47836425 (or 47836422 counting only the distinct ones).

The product of its (nonzero) digits is 36000, while the sum is 36.

The square root of 861055506 is about 29343.7473067091. The cubic root of 861055506 is about 951.3574337999.

The spelling of 861055506 in words is "eight hundred sixty-one million, fifty-five thousand, five hundred six".