861506212 has 24 divisors (see below), whose sum is σ = 1824367104. Its totient is φ = 347498112.

The previous prime is 861506209. The next prime is 861506267. The reversal of 861506212 is 212605168.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 904468 + ... + 905419.

It is an arithmetic number, because the mean of its divisors is an integer number (76015296).

Almost surely, 2^861506212 is an apocalyptic number.

It is an amenable number.

861506212 is an abundant number, since it is smaller than the sum of its proper divisors (962860892).

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

861506212 is a wasteful number, since it uses less digits than its factorization.

861506212 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1809915 (or 1809913 counting only the distinct ones).

The product of its (nonzero) digits is 5760, while the sum is 31.

The square root of 861506212 is about 29351.4260641625. The cubic root of 861506212 is about 951.5233958891.

The spelling of 861506212 in words is "eight hundred sixty-one million, five hundred six thousand, two hundred twelve".