320105557 has 2 divisors, whose sum is σ = 320105558. Its totient is φ = 320105556.

The previous prime is 320105549. The next prime is 320105561. The reversal of 320105557 is 755501023.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 319479876 + 625681 = 17874^2 + 791^2 .

It is an emirp because it is prime and its reverse (755501023) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 320105557 - 2³ = 320105549 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (320108557) 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, 160052778 + 160052779.

It is an arithmetic number, because the mean of its divisors is an integer number (160052779).

Almost surely, 2^320105557 is an apocalyptic number.

It is an amenable number.

320105557 is a deficient number, since it is larger than the sum of its proper divisors (1).

320105557 is an equidigital number, since it uses as much as digits as its factorization.

320105557 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 5250, while the sum is 28.

The square root of 320105557 is about 17891.4939845727. The cubic root of 320105557 is about 684.0655787072.

The spelling of 320105557 in words is "three hundred twenty million, one hundred five thousand, five hundred fifty-seven".