401039321 has 2 divisors, whose sum is σ = 401039322. Its totient is φ = 401039320.

The previous prime is 401039279. The next prime is 401039323. The reversal of 401039321 is 123930104.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 386515600 + 14523721 = 19660^2 + 3811^2 .

It is a cyclic number.

It is not a de Polignac number, because 401039321 - 2¹⁸ = 400777177 is a prime.

It is a Sophie Germain prime.

Together with 401039323, it forms a pair of twin primes.

It is a Chen prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (401039323) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 200519660 + 200519661.

It is an arithmetic number, because the mean of its divisors is an integer number (200519661).

Almost surely, 2^401039321 is an apocalyptic number.

It is an amenable number.

401039321 is a deficient number, since it is larger than the sum of its proper divisors (1).

401039321 is an equidigital number, since it uses as much as digits as its factorization.

401039321 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 648, while the sum is 23.

The square root of 401039321 is about 20025.9661689517. The cubic root of 401039321 is about 737.4438963737.

Adding to 401039321 its reverse (123930104), we get a palindrome (524969425).

The spelling of 401039321 in words is "four hundred one million, thirty-nine thousand, three hundred twenty-one".