861059172 has 12 divisors (see below), whose sum is σ = 2009138096. Its totient is φ = 287019720.

The previous prime is 861059167. The next prime is 861059183. The reversal of 861059172 is 271950168.

It is a tau number, because it is divible by the number of its divisors (12).

It is a self number, because there is not a number n which added to its sum of digits gives 861059172.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 35877454 + ... + 35877477.

Almost surely, 2^861059172 is an apocalyptic number.

It is an amenable number.

861059172 is an abundant number, since it is smaller than the sum of its proper divisors (1148078924).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

861059172 is a wasteful number, since it uses less digits than its factorization.

861059172 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 71754938 (or 71754936 counting only the distinct ones).

The product of its (nonzero) digits is 30240, while the sum is 39.

The square root of 861059172 is about 29343.8097731021. The cubic root of 861059172 is about 951.3587839534.

The spelling of 861059172 in words is "eight hundred sixty-one million, fifty-nine thousand, one hundred seventy-two".