321399361 has 2 divisors, whose sum is σ = 321399362. Its totient is φ = 321399360.

The previous prime is 321399343. The next prime is 321399371. The reversal of 321399361 is 163993123.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 228161025 + 93238336 = 15105^2 + 9656^2 .

It is a cyclic number.

It is not a de Polignac number, because 321399361 - 2¹⁷ = 321268289 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 321399361.

It is not a weakly prime, because it can be changed into another prime (321399371) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 160699680 + 160699681.

It is an arithmetic number, because the mean of its divisors is an integer number (160699681).

Almost surely, 2^321399361 is an apocalyptic number.

It is an amenable number.

321399361 is a deficient number, since it is larger than the sum of its proper divisors (1).

321399361 is an equidigital number, since it uses as much as digits as its factorization.

321399361 is an evil number, because the sum of its binary digits is even.

The product of its digits is 26244, while the sum is 37.

The square root of 321399361 is about 17927.6144815756. The cubic root of 321399361 is about 684.9859595396.

The spelling of 321399361 in words is "three hundred twenty-one million, three hundred ninety-nine thousand, three hundred sixty-one".