216316057 has 4 divisors (see below), whose sum is σ = 217213876. Its totient is φ = 215418240.

The previous prime is 216316049. The next prime is 216316063. The reversal of 216316057 is 750613612.

216316057 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 82011136 + 134304921 = 9056^2 + 11589^2 .

It is a cyclic number.

It is not a de Polignac number, because 216316057 - 2³ = 216316049 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (216316027) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 448548 + ... + 449029.

It is an arithmetic number, because the mean of its divisors is an integer number (54303469).

Almost surely, 2^216316057 is an apocalyptic number.

It is an amenable number.

216316057 is a deficient number, since it is larger than the sum of its proper divisors (897819).

216316057 is an equidigital number, since it uses as much as digits as its factorization.

216316057 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 897818.

The product of its (nonzero) digits is 7560, while the sum is 31.

The square root of 216316057 is about 14707.6870037406. The cubic root of 216316057 is about 600.2925027508.

Adding to 216316057 its reverse (750613612), we get a palindrome (966929669).

The spelling of 216316057 in words is "two hundred sixteen million, three hundred sixteen thousand, fifty-seven".