320243381 has 2 divisors, whose sum is σ = 320243382. Its totient is φ = 320243380.

The previous prime is 320243369. The next prime is 320243389. The reversal of 320243381 is 183342023.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 195720100 + 124523281 = 13990^2 + 11159^2 .

It is an emirp because it is prime and its reverse (183342023) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 320243381 - 2¹⁸ = 319981237 is a prime.

It is a super-2 number, since 2×320243381² = 205111646148622322, which contains 22 as substring.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 320243381.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (320243389) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 160121690 + 160121691.

It is an arithmetic number, because the mean of its divisors is an integer number (160121691).

Almost surely, 2^320243381 is an apocalyptic number.

It is an amenable number.

320243381 is a deficient number, since it is larger than the sum of its proper divisors (1).

320243381 is an equidigital number, since it uses as much as digits as its factorization.

320243381 is an evil number, because the sum of its binary digits is even.

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

The square root of 320243381 is about 17895.3452327693. The cubic root of 320243381 is about 684.1637412502.

The spelling of 320243381 in words is "three hundred twenty million, two hundred forty-three thousand, three hundred eighty-one".