423565321 has 2 divisors, whose sum is σ = 423565322. Its totient is φ = 423565320.

The previous prime is 423565291. The next prime is 423565349. The reversal of 423565321 is 123565324.

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., 344622096 + 78943225 = 18564^2 + 8885^2 .

It is a cyclic number.

It is not a de Polignac number, because 423565321 - 2¹³ = 423557129 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (423565921) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 211782660 + 211782661.

It is an arithmetic number, because the mean of its divisors is an integer number (211782661).

Almost surely, 2^423565321 is an apocalyptic number.

It is an amenable number.

423565321 is a deficient number, since it is larger than the sum of its proper divisors (1).

423565321 is an equidigital number, since it uses as much as digits as its factorization.

423565321 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 21600, while the sum is 31.

The square root of 423565321 is about 20580.7026362075. The cubic root of 423565321 is about 751.0003368787. Note that the first 3 decimals are identical.

The spelling of 423565321 in words is "four hundred twenty-three million, five hundred sixty-five thousand, three hundred twenty-one".