320560421 has 2 divisors, whose sum is σ = 320560422. Its totient is φ = 320560420.

The previous prime is 320560363. The next prime is 320560529. The reversal of 320560421 is 124065023.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 259564321 + 60996100 = 16111^2 + 7810^2 .

It is a cyclic number.

It is not a de Polignac number, because 320560421 - 2²² = 316366117 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (320569421) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 160280210 + 160280211.

It is an arithmetic number, because the mean of its divisors is an integer number (160280211).

Almost surely, 2^320560421 is an apocalyptic number.

It is an amenable number.

320560421 is a deficient number, since it is larger than the sum of its proper divisors (1).

320560421 is an equidigital number, since it uses as much as digits as its factorization.

320560421 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1440, while the sum is 23.

The square root of 320560421 is about 17904.2012108890. The cubic root of 320560421 is about 684.3894401462.

The spelling of 320560421 in words is "three hundred twenty million, five hundred sixty thousand, four hundred twenty-one".