216143257 has 16 divisors (see below), whose sum is σ = 239847552. Its totient is φ = 193144320.

The previous prime is 216143251. The next prime is 216143261. The reversal of 216143257 is 752341612.

It is a cyclic number.

It is not a de Polignac number, because 216143257 - 2¹¹ = 216141209 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (216143251) 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 15 ways as a sum of consecutive naturals, for example, 177583 + ... + 178795.

It is an arithmetic number, because the mean of its divisors is an integer number (14990472).

Almost surely, 2^216143257 is an apocalyptic number.

It is an amenable number.

216143257 is a deficient number, since it is larger than the sum of its proper divisors (23704295).

216143257 is a wasteful number, since it uses less digits than its factorization.

216143257 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1488.

The product of its digits is 10080, while the sum is 31.

The square root of 216143257 is about 14701.8113509867. The cubic root of 216143257 is about 600.1326160565.

Adding to 216143257 its reverse (752341612), we get a palindrome (968484869).

The spelling of 216143257 in words is "two hundred sixteen million, one hundred forty-three thousand, two hundred fifty-seven".