721428593 has 2 divisors, whose sum is σ = 721428594. Its totient is φ = 721428592.

The previous prime is 721428569. The next prime is 721428607. The reversal of 721428593 is 395824127.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 464531809 + 256896784 = 21553^2 + 16028^2 .

It is a cyclic number.

It is not a de Polignac number, because 721428593 - 2⁶ = 721428529 is a prime.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 721428593.

It is not a weakly prime, because it can be changed into another prime (721428503) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 360714296 + 360714297.

It is an arithmetic number, because the mean of its divisors is an integer number (360714297).

Almost surely, 2^721428593 is an apocalyptic number.

It is an amenable number.

721428593 is a deficient number, since it is larger than the sum of its proper divisors (1).

721428593 is an equidigital number, since it uses as much as digits as its factorization.

721428593 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 120960, while the sum is 41.

The square root of 721428593 is about 26859.4227972233. The cubic root of 721428593 is about 896.8733450386.

The spelling of 721428593 in words is "seven hundred twenty-one million, four hundred twenty-eight thousand, five hundred ninety-three".