320857811 has 2 divisors, whose sum is σ = 320857812. Its totient is φ = 320857810.

The previous prime is 320857793. The next prime is 320857819. The reversal of 320857811 is 118758023.

It is a strong prime.

It is an emirp because it is prime and its reverse (118758023) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-320857811 is a prime.

It is a super-3 number, since 3×320857811³ (a number of 26 digits) contains 333 as substring.

It is not a weakly prime, because it can be changed into another prime (320857819) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 160428905 + 160428906.

It is an arithmetic number, because the mean of its divisors is an integer number (160428906).

Almost surely, 2^320857811 is an apocalyptic number.

320857811 is a deficient number, since it is larger than the sum of its proper divisors (1).

320857811 is an equidigital number, since it uses as much as digits as its factorization.

320857811 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 13440, while the sum is 35.

The square root of 320857811 is about 17912.5043196087. The cubic root of 320857811 is about 684.6010150995.

The spelling of 320857811 in words is "three hundred twenty million, eight hundred fifty-seven thousand, eight hundred eleven".