216352541 has 4 divisors (see below), whose sum is σ = 216385500. Its totient is φ = 216319584.

The previous prime is 216352517. The next prime is 216352561. The reversal of 216352541 is 145253612.

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 89226916 + 127125625 = 9446^2 + 11275^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-216352541 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (216352511) 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, 2906 + ... + 21003.

It is an arithmetic number, because the mean of its divisors is an integer number (54096375).

Almost surely, 2^216352541 is an apocalyptic number.

It is an amenable number.

216352541 is a deficient number, since it is larger than the sum of its proper divisors (32959).

216352541 is an equidigital number, since it uses as much as digits as its factorization.

216352541 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 32958.

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

The square root of 216352541 is about 14708.9272552420. The cubic root of 216352541 is about 600.3262494219.

The spelling of 216352541 in words is "two hundred sixteen million, three hundred fifty-two thousand, five hundred forty-one".