320145653 has 2 divisors, whose sum is σ = 320145654. Its totient is φ = 320145652.

The previous prime is 320145641. The next prime is 320145677. The reversal of 320145653 is 356541023.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 249703204 + 70442449 = 15802^2 + 8393^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-320145653 is a prime.

It is a Sophie Germain prime.

It is a Chen prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (320145613) 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 as a sum of consecutive naturals, namely, 160072826 + 160072827.

It is an arithmetic number, because the mean of its divisors is an integer number (160072827).

Almost surely, 2^320145653 is an apocalyptic number.

It is an amenable number.

320145653 is a deficient number, since it is larger than the sum of its proper divisors (1).

320145653 is an equidigital number, since it uses as much as digits as its factorization.

320145653 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 10800, while the sum is 29.

The square root of 320145653 is about 17892.6144819588. The cubic root of 320145653 is about 684.0941392323.

Adding to 320145653 its reverse (356541023), we get a palindrome (676686676).

The spelling of 320145653 in words is "three hundred twenty million, one hundred forty-five thousand, six hundred fifty-three".