720052321 has 2 divisors, whose sum is σ = 720052322. Its totient is φ = 720052320.

The previous prime is 720052309. The next prime is 720052349. The reversal of 720052321 is 123250027.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 438316096 + 281736225 = 20936^2 + 16785^2 .

It is a cyclic number.

It is not a de Polignac number, because 720052321 - 2²⁷ = 585834593 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 720052292 and 720052301.

It is not a weakly prime, because it can be changed into another prime (720052351) 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, 360026160 + 360026161.

It is an arithmetic number, because the mean of its divisors is an integer number (360026161).

Almost surely, 2^720052321 is an apocalyptic number.

It is an amenable number.

720052321 is a deficient number, since it is larger than the sum of its proper divisors (1).

720052321 is an equidigital number, since it uses as much as digits as its factorization.

720052321 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 840, while the sum is 22.

The square root of 720052321 is about 26833.7906565584. The cubic root of 720052321 is about 896.3026591168.

The spelling of 720052321 in words is "seven hundred twenty million, fifty-two thousand, three hundred twenty-one".