320645771 has 2 divisors, whose sum is σ = 320645772. Its totient is φ = 320645770.

The previous prime is 320645747. The next prime is 320645777. The reversal of 320645771 is 177546023.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 320645771 - 2¹⁰ = 320644747 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (320645777) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 160322885 + 160322886.

It is an arithmetic number, because the mean of its divisors is an integer number (160322886).

Almost surely, 2^320645771 is an apocalyptic number.

320645771 is a deficient number, since it is larger than the sum of its proper divisors (1).

320645771 is an equidigital number, since it uses as much as digits as its factorization.

320645771 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 35280, while the sum is 35.

The square root of 320645771 is about 17906.5845710454. The cubic root of 320645771 is about 684.4501748798.

The spelling of 320645771 in words is "three hundred twenty million, six hundred forty-five thousand, seven hundred seventy-one".