320305145 has 8 divisors (see below), whose sum is σ = 397620360. Its totient is φ = 247408000.

The previous prime is 320305133. The next prime is 320305157. The reversal of 320305145 is 541503023.

It is an interprime number because it is at equal distance from previous prime (320305133) and next prime (320305157).

It can be written as a sum of positive squares in 4 ways, for example, as 45010681 + 275294464 = 6709^2 + 16592^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 320305145 - 2⁶ = 320305081 is a prime.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 320305145.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1104356 + ... + 1104645.

It is an arithmetic number, because the mean of its divisors is an integer number (49702545).

Almost surely, 2^320305145 is an apocalyptic number.

It is an amenable number.

320305145 is a deficient number, since it is larger than the sum of its proper divisors (77315215).

320305145 is a wasteful number, since it uses less digits than its factorization.

320305145 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2209035.

The product of its (nonzero) digits is 1800, while the sum is 23.

The square root of 320305145 is about 17897.0708497229. The cubic root of 320305145 is about 684.2077223549.

Adding to 320305145 its reverse (541503023), we get a palindrome (861808168).

It can be divided in two parts, 320305 and 145, that multiplied together give a square (46444225 = 6815²).

The spelling of 320305145 in words is "three hundred twenty million, three hundred five thousand, one hundred forty-five".