215681172 has 24 divisors (see below), whose sum is σ = 575150016. Its totient is φ = 61623168.

The previous prime is 215681171. The next prime is 215681183. The reversal of 215681172 is 271186512.

215681172 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (215681171) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1283733 + ... + 1283900.

It is an arithmetic number, because the mean of its divisors is an integer number (23964584).

Almost surely, 2^215681172 is an apocalyptic number.

It is an amenable number.

215681172 is an abundant number, since it is smaller than the sum of its proper divisors (359468844).

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

215681172 is a wasteful number, since it uses less digits than its factorization.

215681172 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2567647 (or 2567645 counting only the distinct ones).

The product of its digits is 6720, while the sum is 33.

The square root of 215681172 is about 14686.0877023120. The cubic root of 215681172 is about 599.7046435203.

The spelling of 215681172 in words is "two hundred fifteen million, six hundred eighty-one thousand, one hundred seventy-two".