400601321 has 2 divisors, whose sum is σ = 400601322. Its totient is φ = 400601320.

The previous prime is 400601317. The next prime is 400601323. The reversal of 400601321 is 123106004.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 376786921 + 23814400 = 19411^2 + 4880^2 .

It is a cyclic number.

It is not a de Polignac number, because 400601321 - 2² = 400601317 is a prime.

Together with 400601323, it forms a pair of twin primes.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 400601321.

It is not a weakly prime, because it can be changed into another prime (400601323) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 200300660 + 200300661.

It is an arithmetic number, because the mean of its divisors is an integer number (200300661).

Almost surely, 2^400601321 is an apocalyptic number.

It is an amenable number.

400601321 is a deficient number, since it is larger than the sum of its proper divisors (1).

400601321 is an equidigital number, since it uses as much as digits as its factorization.

400601321 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 144, while the sum is 17.

The square root of 400601321 is about 20015.0273794467. The cubic root of 400601321 is about 737.1753291197.

Adding to 400601321 its reverse (123106004), we get a palindrome (523707325).

The spelling of 400601321 in words is "four hundred million, six hundred one thousand, three hundred twenty-one".