861022198 has 8 divisors (see below), whose sum is σ = 1312706160. Its totient is φ = 423453480.

The previous prime is 861022193. The next prime is 861022199. The reversal of 861022198 is 891220168.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (861022193) 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 3 ways as a sum of consecutive naturals, for example, 3528658 + ... + 3528901.

It is an arithmetic number, because the mean of its divisors is an integer number (164088270).

Almost surely, 2^861022198 is an apocalyptic number.

861022198 is a deficient number, since it is larger than the sum of its proper divisors (451683962).

861022198 is a wasteful number, since it uses less digits than its factorization.

861022198 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7057622.

The product of its (nonzero) digits is 13824, while the sum is 37.

The square root of 861022198 is about 29343.1797527126. The cubic root of 861022198 is about 951.3451665992.

The spelling of 861022198 in words is "eight hundred sixty-one million, twenty-two thousand, one hundred ninety-eight".