321311999 has 2 divisors, whose sum is σ = 321312000. Its totient is φ = 321311998.

The previous prime is 321311989. The next prime is 321312011. The reversal of 321311999 is 999113123.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 321311999 - 2¹⁶ = 321246463 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (321311989) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 160655999 + 160656000.

It is an arithmetic number, because the mean of its divisors is an integer number (160656000).

Almost surely, 2^321311999 is an apocalyptic number.

321311999 is a deficient number, since it is larger than the sum of its proper divisors (1).

321311999 is an equidigital number, since it uses as much as digits as its factorization.

321311999 is an evil number, because the sum of its binary digits is even.

The product of its digits is 13122, while the sum is 38.

The square root of 321311999 is about 17925.1777954920. The cubic root of 321311999 is about 684.9238901710.

The spelling of 321311999 in words is "three hundred twenty-one million, three hundred eleven thousand, nine hundred ninety-nine".