321280343 has 4 divisors (see below), whose sum is σ = 326075640. Its totient is φ = 316485048.

The previous prime is 321280339. The next prime is 321280363. The reversal of 321280343 is 343082123.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 343082123 = 5839 ⋅58757.

It is a cyclic number.

It is not a de Polignac number, because 321280343 - 2² = 321280339 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (321280303) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2397548 + ... + 2397681.

It is an arithmetic number, because the mean of its divisors is an integer number (81518910).

Almost surely, 2^321280343 is an apocalyptic number.

321280343 is a deficient number, since it is larger than the sum of its proper divisors (4795297).

321280343 is an equidigital number, since it uses as much as digits as its factorization.

321280343 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4795296.

The product of its (nonzero) digits is 3456, while the sum is 26.

The square root of 321280343 is about 17924.2947699484. The cubic root of 321280343 is about 684.9013962888.

The spelling of 321280343 in words is "three hundred twenty-one million, two hundred eighty thousand, three hundred forty-three".