861841197242 has 8 divisors (see below), whose sum is σ = 1292786932500. Its totient is φ = 430912219744.

The previous prime is 861841197227. The next prime is 861841197253. The reversal of 861841197242 is 242791148168.

It can be written as a sum of positive squares in 2 ways, for example, as 725169761761 + 136671435481 = 851569^2 + 369691^2 .

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

It is an unprimeable number.

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 3 ways as a sum of consecutive naturals, for example, 4060067 + ... + 4267062.

Almost surely, 2^861841197242 is an apocalyptic number.

861841197242 is a deficient number, since it is larger than the sum of its proper divisors (430945735258).

861841197242 is a wasteful number, since it uses less digits than its factorization.

861841197242 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8378880.

The product of its digits is 1548288, while the sum is 53.

The spelling of 861841197242 in words is "eight hundred sixty-one billion, eight hundred forty-one million, one hundred ninety-seven thousand, two hundred forty-two".