216532145 has 16 divisors (see below), whose sum is σ = 275587920. Its totient is φ = 162760704.

The previous prime is 216532093. The next prime is 216532157. The reversal of 216532145 is 541235612.

It can be written as a sum of positive squares in 8 ways, for example, as 10523536 + 206008609 = 3244^2 + 14353^2 .

It is a cyclic number.

It is not a de Polignac number, because 216532145 - 2⁶ = 216532081 is a prime.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 58469 + ... + 62061.

It is an arithmetic number, because the mean of its divisors is an integer number (17224245).

Almost surely, 2^216532145 is an apocalyptic number.

It is an amenable number.

216532145 is a deficient number, since it is larger than the sum of its proper divisors (59055775).

216532145 is a wasteful number, since it uses less digits than its factorization.

216532145 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4324.

The product of its digits is 7200, while the sum is 29.

The square root of 216532145 is about 14715.0312605852. The cubic root of 216532145 is about 600.4923227718.

Adding to 216532145 its reverse (541235612), we get a palindrome (757767757).

The spelling of 216532145 in words is "two hundred sixteen million, five hundred thirty-two thousand, one hundred forty-five".