861055544 has 8 divisors (see below), whose sum is σ = 1614479160. Its totient is φ = 430527768.

The previous prime is 861055511. The next prime is 861055561. The reversal of 861055544 is 445550168.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (8).

It is a junction number, because it is equal to n+sod(n) for n = 861055498 and 861055507.

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, 53815964 + ... + 53815979.

It is an arithmetic number, because the mean of its divisors is an integer number (201809895).

Almost surely, 2^861055544 is an apocalyptic number.

It is an amenable number.

861055544 is a deficient number, since it is larger than the sum of its proper divisors (753423616).

861055544 is a wasteful number, since it uses less digits than its factorization.

861055544 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 107631949 (or 107631945 counting only the distinct ones).

The product of its (nonzero) digits is 96000, while the sum is 38.

The square root of 861055544 is about 29343.7479542065. The cubic root of 861055544 is about 951.3574477949.

The spelling of 861055544 in words is "eight hundred sixty-one million, fifty-five thousand, five hundred forty-four".