861191232 has 112 divisors (see below), whose sum is σ = 2501140032. Its totient is φ = 259348480.

The previous prime is 861191197. The next prime is 861191237. The reversal of 861191232 is 232191168.

It is a Harshad number since it is a multiple of its sum of digits (33).

It is a junction number, because it is equal to n+sod(n) for n = 861191193 and 861191202.

It is not an unprimeable number, because it can be changed into a prime (861191237) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 364198 + ... + 366554.

Almost surely, 2^861191232 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 861191232, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1250570016).

861191232 is an abundant number, since it is smaller than the sum of its proper divisors (1639948800).

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

861191232 is a wasteful number, since it uses less digits than its factorization.

861191232 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2556 (or 2546 counting only the distinct ones).

The product of its digits is 5184, while the sum is 33.

The square root of 861191232 is about 29346.0599058886. The cubic root of 861191232 is about 951.4074178618.

The spelling of 861191232 in words is "eight hundred sixty-one million, one hundred ninety-one thousand, two hundred thirty-two".