1223216161 has 2 divisors, whose sum is σ = 1223216162. Its totient is φ = 1223216160.

The previous prime is 1223216149. The next prime is 1223216173. The reversal of 1223216161 is 1616123221.

It is a happy number.

It is a balanced prime because it is at equal distance from previous prime (1223216149) and next prime (1223216173).

It can be written as a sum of positive squares in only one way, i.e., 860542225 + 362673936 = 29335^2 + 19044^2 .

It is a cyclic number.

It is not a de Polignac number, because 1223216161 - 2⁵ = 1223216129 is a prime.

It is not a weakly prime, because it can be changed into another prime (1223216131) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 611608080 + 611608081.

It is an arithmetic number, because the mean of its divisors is an integer number (611608081).

Almost surely, 2^1223216161 is an apocalyptic number.

It is an amenable number.

1223216161 is a deficient number, since it is larger than the sum of its proper divisors (1).

1223216161 is an equidigital number, since it uses as much as digits as its factorization.

1223216161 is an evil number, because the sum of its binary digits is even.

The product of its digits is 864, while the sum is 25.

The square root of 1223216161 is about 34974.5073017477. The cubic root of 1223216161 is about 1069.4678580833.

Adding to 1223216161 its reverse (1616123221), we get a palindrome (2839339382).

The spelling of 1223216161 in words is "one billion, two hundred twenty-three million, two hundred sixteen thousand, one hundred sixty-one".