216657241 has 4 divisors (see below), whose sum is σ = 216693684. Its totient is φ = 216620800.

The previous prime is 216657227. The next prime is 216657253. The reversal of 216657241 is 142756612.

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 197262025 + 19395216 = 14045^2 + 4404^2 .

It is a cyclic number.

It is not a de Polignac number, because 216657241 - 2⁷ = 216657113 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 216657197 and 216657206.

It is not an unprimeable number, because it can be changed into a prime (216657271) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 7000 + ... + 21961.

It is an arithmetic number, because the mean of its divisors is an integer number (54173421).

Almost surely, 2^216657241 is an apocalyptic number.

It is an amenable number.

216657241 is a deficient number, since it is larger than the sum of its proper divisors (36443).

216657241 is an equidigital number, since it uses as much as digits as its factorization.

216657241 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 36442.

The product of its digits is 20160, while the sum is 34.

The square root of 216657241 is about 14719.2812664206. The cubic root of 216657241 is about 600.6079402878.

The spelling of 216657241 in words is "two hundred sixteen million, six hundred fifty-seven thousand, two hundred forty-one".