861512016 has 20 divisors (see below), whose sum is σ = 2225572832. Its totient is φ = 287170656.

The previous prime is 861511997. The next prime is 861512017. The reversal of 861512016 is 610215168.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (861512017) 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 3 ways as a sum of consecutive naturals, for example, 8974036 + ... + 8974131.

Almost surely, 2^861512016 is an apocalyptic number.

It is an amenable number.

861512016 is an abundant number, since it is smaller than the sum of its proper divisors (1364060816).

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

861512016 is a wasteful number, since it uses less digits than its factorization.

861512016 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17948178 (or 17948172 counting only the distinct ones).

The product of its (nonzero) digits is 2880, while the sum is 30.

The square root of 861512016 is about 29351.5249348309. The cubic root of 861512016 is about 951.5255327007.

The spelling of 861512016 in words is "eight hundred sixty-one million, five hundred twelve thousand, sixteen".