320243293 has 2 divisors, whose sum is σ = 320243294. Its totient is φ = 320243292.

The previous prime is 320243267. The next prime is 320243311. The reversal of 320243293 is 392342023.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 295908804 + 24334489 = 17202^2 + 4933^2 .

It is an emirp because it is prime and its reverse (392342023) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-320243293 is a prime.

It is a super-2 number, since 2×320243293² = 205111533422967698, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (320243213) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 160121646 + 160121647.

It is an arithmetic number, because the mean of its divisors is an integer number (160121647).

Almost surely, 2^320243293 is an apocalyptic number.

It is an amenable number.

320243293 is a deficient number, since it is larger than the sum of its proper divisors (1).

320243293 is an equidigital number, since it uses as much as digits as its factorization.

320243293 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 7776, while the sum is 28.

The square root of 320243293 is about 17895.3427740292. The cubic root of 320243293 is about 684.1636785828.

The spelling of 320243293 in words is "three hundred twenty million, two hundred forty-three thousand, two hundred ninety-three".