216204641 has 2 divisors, whose sum is σ = 216204642. Its totient is φ = 216204640.

The previous prime is 216204619. The next prime is 216204671. The reversal of 216204641 is 146402612.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 190550416 + 25654225 = 13804^2 + 5065^2 .

It is a cyclic number.

It is not a de Polignac number, because 216204641 - 2²⁶ = 149095777 is a prime.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 216204641.

It is not a weakly prime, because it can be changed into another prime (216204671) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 108102320 + 108102321.

It is an arithmetic number, because the mean of its divisors is an integer number (108102321).

Almost surely, 2^216204641 is an apocalyptic number.

It is an amenable number.

216204641 is a deficient number, since it is larger than the sum of its proper divisors (1).

216204641 is an equidigital number, since it uses as much as digits as its factorization.

216204641 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2304, while the sum is 26.

The square root of 216204641 is about 14703.8988367031. The cubic root of 216204641 is about 600.1894225996.

The spelling of 216204641 in words is "two hundred sixteen million, two hundred four thousand, six hundred forty-one".