861973755 has 24 divisors (see below), whose sum is σ = 1425105936. Its totient is φ = 444882240.

The previous prime is 861973747. The next prime is 861973759. The reversal of 861973755 is 557379168.

It is not a de Polignac number, because 861973755 - 2³ = 861973747 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 861973698 and 861973707.

It is not an unprimeable number, because it can be changed into a prime (861973759) 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 23 ways as a sum of consecutive naturals, for example, 15484 + ... + 44313.

It is an arithmetic number, because the mean of its divisors is an integer number (59379414).

Almost surely, 2^861973755 is an apocalyptic number.

861973755 is a deficient number, since it is larger than the sum of its proper divisors (563132181).

861973755 is a wasteful number, since it uses less digits than its factorization.

861973755 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 59867 (or 59836 counting only the distinct ones).

The product of its digits is 1587600, while the sum is 51.

The square root of 861973755 is about 29359.3895542806. The cubic root of 861973755 is about 951.6954966595.

The spelling of 861973755 in words is "eight hundred sixty-one million, nine hundred seventy-three thousand, seven hundred fifty-five".