216533541 has 16 divisors (see below), whose sum is σ = 330328064. Its totient is φ = 123593904.

The previous prime is 216533503. The next prime is 216533579. The reversal of 216533541 is 145335612.

It is an interprime number because it is at equal distance from previous prime (216533503) and next prime (216533579).

It is not a de Polignac number, because 216533541 - 2¹⁰ = 216532517 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 216533499 and 216533508.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (216533441) by changing a digit.

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, 14976 + ... + 25638.

It is an arithmetic number, because the mean of its divisors is an integer number (20645504).

Almost surely, 2^216533541 is an apocalyptic number.

216533541 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

It is an amenable number.

216533541 is a deficient number, since it is larger than the sum of its proper divisors (113794523).

216533541 is a wasteful number, since it uses less digits than its factorization.

216533541 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11640.

The product of its digits is 10800, while the sum is 30.

The square root of 216533541 is about 14715.0786949985. The cubic root of 216533541 is about 600.4936132430.

The spelling of 216533541 in words is "two hundred sixteen million, five hundred thirty-three thousand, five hundred forty-one".