219055961 has 2 divisors, whose sum is σ = 219055962. Its totient is φ = 219055960.

The previous prime is 219055939. The next prime is 219056003. The reversal of 219055961 is 169550912.

219055961 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 169494361 + 49561600 = 13019^2 + 7040^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-219055961 is a prime.

It is a Sophie Germain prime.

It is a Chen prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (219055561) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 109527980 + 109527981.

It is an arithmetic number, because the mean of its divisors is an integer number (109527981).

Almost surely, 2^219055961 is an apocalyptic number.

It is an amenable number.

219055961 is a deficient number, since it is larger than the sum of its proper divisors (1).

219055961 is an equidigital number, since it uses as much as digits as its factorization.

219055961 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 24300, while the sum is 38.

The square root of 219055961 is about 14800.5392131503. The cubic root of 219055961 is about 602.8163530931.

The spelling of 219055961 in words is "two hundred nineteen million, fifty-five thousand, nine hundred sixty-one".