1223202161 has 2 divisors, whose sum is σ = 1223202162. Its totient is φ = 1223202160.

The previous prime is 1223202143. The next prime is 1223202257. The reversal of 1223202161 is 1612023221.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1202771761 + 20430400 = 34681^2 + 4520^2 .

It is an emirp because it is prime and its reverse (1612023221) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1223202161 is a prime.

It is not a weakly prime, because it can be changed into another prime (1223202961) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 611601080 + 611601081.

It is an arithmetic number, because the mean of its divisors is an integer number (611601081).

Almost surely, 2^1223202161 is an apocalyptic number.

It is an amenable number.

1223202161 is a deficient number, since it is larger than the sum of its proper divisors (1).

1223202161 is an equidigital number, since it uses as much as digits as its factorization.

1223202161 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 288, while the sum is 20.

The square root of 1223202161 is about 34974.3071553962. The cubic root of 1223202161 is about 1069.4637779631.

Adding to 1223202161 its reverse (1612023221), we get a palindrome (2835225382).

The spelling of 1223202161 in words is "one billion, two hundred twenty-three million, two hundred two thousand, one hundred sixty-one".