861224841 has 6 divisors (see below), whose sum is σ = 1243991450. Its totient is φ = 574149888.

The previous prime is 861224807. The next prime is 861224863. The reversal of 861224841 is 148422168.

It can be written as a sum of positive squares in only one way, i.e., 726572025 + 134652816 = 26955^2 + 11604^2 .

It is not a de Polignac number, because 861224841 - 2⁷ = 861224713 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 861224796 and 861224805.

It is not an unprimeable number, because it can be changed into a prime (861224801) 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 5 ways as a sum of consecutive naturals, for example, 47845816 + ... + 47845833.

Almost surely, 2^861224841 is an apocalyptic number.

It is an amenable number.

861224841 is a deficient number, since it is larger than the sum of its proper divisors (382766609).

861224841 is a wasteful number, since it uses less digits than its factorization.

861224841 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 95691655 (or 95691652 counting only the distinct ones).

The product of its digits is 24576, while the sum is 36.

The square root of 861224841 is about 29346.6325325411. The cubic root of 861224841 is about 951.4197942984.

The spelling of 861224841 in words is "eight hundred sixty-one million, two hundred twenty-four thousand, eight hundred forty-one".