861181822 has 4 divisors (see below), whose sum is σ = 1291772736. Its totient is φ = 430590910.

The previous prime is 861181819. The next prime is 861181831. The reversal of 861181822 is 228181168.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 215295454 + ... + 215295457.

It is an arithmetic number, because the mean of its divisors is an integer number (322943184).

Almost surely, 2^861181822 is an apocalyptic number.

861181822 is a deficient number, since it is larger than the sum of its proper divisors (430590914).

861181822 is a wasteful number, since it uses less digits than its factorization.

861181822 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 430590913.

The product of its digits is 12288, while the sum is 37.

The square root of 861181822 is about 29345.8995772834. The cubic root of 861181822 is about 951.4039525933.

The spelling of 861181822 in words is "eight hundred sixty-one million, one hundred eighty-one thousand, eight hundred twenty-two".