218016961 has 2 divisors, whose sum is σ = 218016962. Its totient is φ = 218016960.

The previous prime is 218016943. The next prime is 218016979. The reversal of 218016961 is 169610812.

It is a balanced prime because it is at equal distance from previous prime (218016943) and next prime (218016979).

It can be written as a sum of positive squares in only one way, i.e., 145443600 + 72573361 = 12060^2 + 8519^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-218016961 is a prime.

It is not a weakly prime, because it can be changed into another prime (218016991) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 109008480 + 109008481.

It is an arithmetic number, because the mean of its divisors is an integer number (109008481).

Almost surely, 2^218016961 is an apocalyptic number.

It is an amenable number.

218016961 is a deficient number, since it is larger than the sum of its proper divisors (1).

218016961 is an equidigital number, since it uses as much as digits as its factorization.

218016961 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 5184, while the sum is 34.

The square root of 218016961 is about 14765.3974209975. The cubic root of 218016961 is about 601.8617735052.

The spelling of 218016961 in words is "two hundred eighteen million, sixteen thousand, nine hundred sixty-one".