320441257 has 2 divisors, whose sum is σ = 320441258. Its totient is φ = 320441256.

The previous prime is 320441249. The next prime is 320441263. The reversal of 320441257 is 752144023.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 215972416 + 104468841 = 14696^2 + 10221^2 .

It is an emirp because it is prime and its reverse (752144023) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 320441257 - 2³ = 320441249 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (320441227) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 160220628 + 160220629.

It is an arithmetic number, because the mean of its divisors is an integer number (160220629).

Almost surely, 2^320441257 is an apocalyptic number.

It is an amenable number.

320441257 is a deficient number, since it is larger than the sum of its proper divisors (1).

320441257 is an equidigital number, since it uses as much as digits as its factorization.

320441257 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 6720, while the sum is 28.

The square root of 320441257 is about 17900.8730792663. The cubic root of 320441257 is about 684.3046254638.

The spelling of 320441257 in words is "three hundred twenty million, four hundred forty-one thousand, two hundred fifty-seven".