861541822 has 4 divisors (see below), whose sum is σ = 1292312736. Its totient is φ = 430770910.

The previous prime is 861541789. The next prime is 861541823. The reversal of 861541822 is 228145168.

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

It is a super-2 number, since 2×861541822² = 1484508622110159368, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (861541823) 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 as a sum of consecutive naturals, namely, 215385454 + ... + 215385457.

It is an arithmetic number, because the mean of its divisors is an integer number (323078184).

Almost surely, 2^861541822 is an apocalyptic number.

861541822 is a deficient number, since it is larger than the sum of its proper divisors (430770914).

861541822 is a wasteful number, since it uses less digits than its factorization.

861541822 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 430770913.

The product of its digits is 30720, while the sum is 37.

The square root of 861541822 is about 29352.0326723721. The cubic root of 861541822 is about 951.5365059827.

The spelling of 861541822 in words is "eight hundred sixty-one million, five hundred forty-one thousand, eight hundred twenty-two".