320130257 has 4 divisors (see below), whose sum is σ = 325378356. Its totient is φ = 314882160.

The previous prime is 320130203. The next prime is 320130263. The reversal of 320130257 is 752031023.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 83247376 + 236882881 = 9124^2 + 15391^2 .

It is a cyclic number.

It is not a de Polignac number, because 320130257 - 2¹² = 320126161 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (320130277) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2623958 + ... + 2624079.

It is an arithmetic number, because the mean of its divisors is an integer number (81344589).

Almost surely, 2^320130257 is an apocalyptic number.

It is an amenable number.

320130257 is a deficient number, since it is larger than the sum of its proper divisors (5248099).

320130257 is an equidigital number, since it uses as much as digits as its factorization.

320130257 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5248098.

The product of its (nonzero) digits is 1260, while the sum is 23.

The square root of 320130257 is about 17892.1842434064. The cubic root of 320130257 is about 684.0831728881.

The spelling of 320130257 in words is "three hundred twenty million, one hundred thirty thousand, two hundred fifty-seven".