423621161 has 2 divisors, whose sum is σ = 423621162. Its totient is φ = 423621160.

The previous prime is 423621091. The next prime is 423621167. The reversal of 423621161 is 161126324.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 417589225 + 6031936 = 20435^2 + 2456^2 .

It is a cyclic number.

It is not a de Polignac number, because 423621161 - 2¹⁰ = 423620137 is a prime.

It is a Sophie Germain prime.

It is a Chen prime.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 423621161.

It is not a weakly prime, because it can be changed into another prime (423621167) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 211810580 + 211810581.

It is an arithmetic number, because the mean of its divisors is an integer number (211810581).

Almost surely, 2^423621161 is an apocalyptic number.

It is an amenable number.

423621161 is a deficient number, since it is larger than the sum of its proper divisors (1).

423621161 is an equidigital number, since it uses as much as digits as its factorization.

423621161 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1728, while the sum is 26.

The square root of 423621161 is about 20582.0592021304. The cubic root of 423621161 is about 751.0333377045.

Adding to 423621161 its reverse (161126324), we get a palindrome (584747485).

The spelling of 423621161 in words is "four hundred twenty-three million, six hundred twenty-one thousand, one hundred sixty-one".