406511321 has 2 divisors, whose sum is σ = 406511322. Its totient is φ = 406511320.

The previous prime is 406511291. The next prime is 406511333. The reversal of 406511321 is 123115604.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 406224025 + 287296 = 20155^2 + 536^2 .

It is a cyclic number.

It is not a de Polignac number, because 406511321 - 2¹⁴ = 406494937 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (406514321) 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, 203255660 + 203255661.

It is an arithmetic number, because the mean of its divisors is an integer number (203255661).

Almost surely, 2^406511321 is an apocalyptic number.

It is an amenable number.

406511321 is a deficient number, since it is larger than the sum of its proper divisors (1).

406511321 is an equidigital number, since it uses as much as digits as its factorization.

406511321 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 720, while the sum is 23.

The square root of 406511321 is about 20162.1259047750. The cubic root of 406511321 is about 740.7827856148.

Adding to 406511321 its reverse (123115604), we get a palindrome (529626925).

The spelling of 406511321 in words is "four hundred six million, five hundred eleven thousand, three hundred twenty-one".