320645641 has 2 divisors, whose sum is σ = 320645642. Its totient is φ = 320645640.

The previous prime is 320645629. The next prime is 320645657. The reversal of 320645641 is 146546023.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 282946041 + 37699600 = 16821^2 + 6140^2 .

It is a cyclic number.

It is not a de Polignac number, because 320645641 - 2¹⁷ = 320514569 is a prime.

It is not a weakly prime, because it can be changed into another prime (320643641) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 160322820 + 160322821.

It is an arithmetic number, because the mean of its divisors is an integer number (160322821).

Almost surely, 2^320645641 is an apocalyptic number.

It is an amenable number.

320645641 is a deficient number, since it is larger than the sum of its proper divisors (1).

320645641 is an equidigital number, since it uses as much as digits as its factorization.

320645641 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 17280, while the sum is 31.

The square root of 320645641 is about 17906.5809410954. The cubic root of 320645641 is about 684.4500823805.

The spelling of 320645641 in words is "three hundred twenty million, six hundred forty-five thousand, six hundred forty-one".