861000198 has 32 divisors (see below), whose sum is σ = 1782984960. Its totient is φ = 276853920.

The previous prime is 861000197. The next prime is 861000199. The reversal of 861000198 is 891000168.

It is an interprime number because it is at equal distance from previous prime (861000197) and next prime (861000199).

861000198 is a strobogrammatic number because it is the same when read upside-down.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (861000197) 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 in 15 ways as a sum of consecutive naturals, for example, 361953 + ... + 364323.

It is an arithmetic number, because the mean of its divisors is an integer number (55718280).

Almost surely, 2^861000198 is an apocalyptic number.

861000198 is an abundant number, since it is smaller than the sum of its proper divisors (921984762).

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

861000198 is a wasteful number, since it uses less digits than its factorization.

861000198 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4492.

The product of its (nonzero) digits is 3456, while the sum is 33.

The square root of 861000198 is about 29342.8048761532. The cubic root of 861000198 is about 951.3370639154.

The spelling of 861000198 in words is "eight hundred sixty-one million, one hundred ninety-eight", and thus it is an aban number.