861956883 has 20 divisors (see below), whose sum is σ = 1290296568. Its totient is φ = 573441120.

The previous prime is 861956867. The next prime is 861956897. The reversal of 861956883 is 388659168.

It is not a de Polignac number, because 861956883 - 2⁴ = 861956867 is a prime.

It is not an unprimeable number, because it can be changed into a prime (861956803) by changing a digit.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 28935 + ... + 50607.

Almost surely, 2^861956883 is an apocalyptic number.

861956883 is a deficient number, since it is larger than the sum of its proper divisors (428339685).

861956883 is a wasteful number, since it uses less digits than its factorization.

861956883 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22176 (or 22167 counting only the distinct ones).

The product of its digits is 2488320, while the sum is 54.

The square root of 861956883 is about 29359.1022172000. The cubic root of 861956883 is about 951.6892872240.

The spelling of 861956883 in words is "eight hundred sixty-one million, nine hundred fifty-six thousand, eight hundred eighty-three".