216941 has 4 divisors (see below), whose sum is σ = 217884. Its totient is φ = 216000.

The previous prime is 216919. The next prime is 216947. The reversal of 216941 is 149612.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in 2 ways, for example, as 168100 + 48841 = 410^2 + 221^2 .

It is a cyclic number.

It is not a de Polignac number, because 216941 - 2⁶ = 216877 is a prime.

It is an alternating number because its digits alternate between even and odd.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 216941.

It is not an unprimeable number, because it can be changed into a prime (216947) 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, 131 + ... + 671.

It is an arithmetic number, because the mean of its divisors is an integer number (54471).

2²¹⁶⁹⁴¹ is an apocalyptic number.

It is an amenable number.

216941 is a deficient number, since it is larger than the sum of its proper divisors (943).

216941 is an equidigital number, since it uses as much as digits as its factorization.

216941 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 942.

The product of its digits is 432, while the sum is 23.

The square root of 216941 is about 465.7692561773. The cubic root of 216941 is about 60.0870034088.

The spelling of 216941 in words is "two hundred sixteen thousand, nine hundred forty-one".