423222161 has 2 divisors, whose sum is σ = 423222162. Its totient is φ = 423222160.

The previous prime is 423222109. The next prime is 423222187. The reversal of 423222161 is 161222324.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 418447936 + 4774225 = 20456^2 + 2185^2 .

It is a cyclic number.

It is not a de Polignac number, because 423222161 - 2⁶ = 423222097 is a prime.

It is not a weakly prime, because it can be changed into another prime (423222101) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 211611080 + 211611081.

It is an arithmetic number, because the mean of its divisors is an integer number (211611081).

Almost surely, 2^423222161 is an apocalyptic number.

It is an amenable number.

423222161 is a deficient number, since it is larger than the sum of its proper divisors (1).

423222161 is an equidigital number, since it uses as much as digits as its factorization.

423222161 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1152, while the sum is 23.

The square root of 423222161 is about 20572.3640109736. The cubic root of 423222161 is about 750.7974693859.

Adding to 423222161 its reverse (161222324), we get a palindrome (584444485).

The spelling of 423222161 in words is "four hundred twenty-three million, two hundred twenty-two thousand, one hundred sixty-one".