320370857 has 2 divisors, whose sum is σ = 320370858. Its totient is φ = 320370856.

The previous prime is 320370829. The next prime is 320370877. The reversal of 320370857 is 758073023.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 243703321 + 76667536 = 15611^2 + 8756^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-320370857 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (320370877) 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, 160185428 + 160185429.

It is an arithmetic number, because the mean of its divisors is an integer number (160185429).

Almost surely, 2^320370857 is an apocalyptic number.

It is an amenable number.

320370857 is a deficient number, since it is larger than the sum of its proper divisors (1).

320370857 is an equidigital number, since it uses as much as digits as its factorization.

320370857 is an odious number, because the sum of its binary digits is odd.

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

The square root of 320370857 is about 17898.9065867164. The cubic root of 320370857 is about 684.2545085568.

The spelling of 320370857 in words is "three hundred twenty million, three hundred seventy thousand, eight hundred fifty-seven".