320879557 has 2 divisors, whose sum is σ = 320879558. Its totient is φ = 320879556.

The previous prime is 320879521. The next prime is 320879561. The reversal of 320879557 is 755978023.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 304118721 + 16760836 = 17439^2 + 4094^2 .

It is a cyclic number.

It is not a de Polignac number, because 320879557 - 2¹¹ = 320877509 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (320879567) 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, 160439778 + 160439779.

It is an arithmetic number, because the mean of its divisors is an integer number (160439779).

Almost surely, 2^320879557 is an apocalyptic number.

It is an amenable number.

320879557 is a deficient number, since it is larger than the sum of its proper divisors (1).

320879557 is an equidigital number, since it uses as much as digits as its factorization.

320879557 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 529200, while the sum is 46.

The square root of 320879557 is about 17913.1113154583. Note that the first 3 decimals coincide. The cubic root of 320879557 is about 684.6164809298.

The spelling of 320879557 in words is "three hundred twenty million, eight hundred seventy-nine thousand, five hundred fifty-seven".