321344789 has 2 divisors, whose sum is σ = 321344790. Its totient is φ = 321344788.

The previous prime is 321344743. The next prime is 321344813. The reversal of 321344789 is 987443123.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 319336900 + 2007889 = 17870^2 + 1417^2 .

It is an emirp because it is prime and its reverse (987443123) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 321344789 - 2²⁴ = 304567573 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (321344689) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 160672394 + 160672395.

It is an arithmetic number, because the mean of its divisors is an integer number (160672395).

Almost surely, 2^321344789 is an apocalyptic number.

It is an amenable number.

321344789 is a deficient number, since it is larger than the sum of its proper divisors (1).

321344789 is an equidigital number, since it uses as much as digits as its factorization.

321344789 is an evil number, because the sum of its binary digits is even.

The product of its digits is 145152, while the sum is 41.

The square root of 321344789 is about 17926.0924074378. The cubic root of 321344789 is about 684.9471882846.

The spelling of 321344789 in words is "three hundred twenty-one million, three hundred forty-four thousand, seven hundred eighty-nine".