320748193 has 2 divisors, whose sum is σ = 320748194. Its totient is φ = 320748192.

The previous prime is 320748161. The next prime is 320748247. The reversal of 320748193 is 391847023.

It is the 7312-nd star number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 199572129 + 121176064 = 14127^2 + 11008^2 .

It is an emirp because it is prime and its reverse (391847023) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 320748193 - 2⁵ = 320748161 is a prime.

It is equal to p_17313499 and since 320748193 and 17313499 have the same sum of digits, it is a Honaker prime.

It is not a weakly prime, because it can be changed into another prime (320748143) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 160374096 + 160374097.

It is an arithmetic number, because the mean of its divisors is an integer number (160374097).

Almost surely, 2^320748193 is an apocalyptic number.

It is an amenable number.

320748193 is a deficient number, since it is larger than the sum of its proper divisors (1).

320748193 is an equidigital number, since it uses as much as digits as its factorization.

320748193 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 36288, while the sum is 37.

The square root of 320748193 is about 17909.4442404001. Note that the first 3 decimals coincide. The cubic root of 320748193 is about 684.5230437581.

The spelling of 320748193 in words is "three hundred twenty million, seven hundred forty-eight thousand, one hundred ninety-three".