320511641 has 2 divisors, whose sum is σ = 320511642. Its totient is φ = 320511640.

The previous prime is 320511619. The next prime is 320511673. The reversal of 320511641 is 146115023.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 315240025 + 5271616 = 17755^2 + 2296^2 .

It is an emirp because it is prime and its reverse (146115023) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-320511641 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (320511041) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 160255820 + 160255821.

It is an arithmetic number, because the mean of its divisors is an integer number (160255821).

Almost surely, 2^320511641 is an apocalyptic number.

It is an amenable number.

320511641 is a deficient number, since it is larger than the sum of its proper divisors (1).

320511641 is an equidigital number, since it uses as much as digits as its factorization.

320511641 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 720, while the sum is 23.

The square root of 320511641 is about 17902.8389089552. The cubic root of 320511641 is about 684.3547236433.

Adding to 320511641 its reverse (146115023), we get a palindrome (466626664).

The spelling of 320511641 in words is "three hundred twenty million, five hundred eleven thousand, six hundred forty-one".