215641312 has 36 divisors (see below), whose sum is σ = 432885600. Its totient is φ = 105742208.

The previous prime is 215641297. The next prime is 215641337. The reversal of 215641312 is 213146512.

It is a happy number.

215641312 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 88689 + ... + 91087.

It is an arithmetic number, because the mean of its divisors is an integer number (12024600).

Almost surely, 2^215641312 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 215641312, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (216442800).

215641312 is an abundant number, since it is smaller than the sum of its proper divisors (217244288).

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

215641312 is an equidigital number, since it uses as much as digits as its factorization.

215641312 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2515 (or 2454 counting only the distinct ones).

The product of its digits is 1440, while the sum is 25.

The square root of 215641312 is about 14684.7305729455. The cubic root of 215641312 is about 599.6676974738.

Adding to 215641312 its reverse (213146512), we get a palindrome (428787824).

The spelling of 215641312 in words is "two hundred fifteen million, six hundred forty-one thousand, three hundred twelve".