725245321 has 2 divisors, whose sum is σ = 725245322. Its totient is φ = 725245320.

The previous prime is 725245309. The next prime is 725245327. The reversal of 725245321 is 123542527.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 675740025 + 49505296 = 25995^2 + 7036^2 .

It is a cyclic number.

It is not a de Polignac number, because 725245321 - 2⁵ = 725245289 is a prime.

It is not a weakly prime, because it can be changed into another prime (725245327) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 362622660 + 362622661.

It is an arithmetic number, because the mean of its divisors is an integer number (362622661).

Almost surely, 2^725245321 is an apocalyptic number.

It is an amenable number.

725245321 is a deficient number, since it is larger than the sum of its proper divisors (1).

725245321 is an equidigital number, since it uses as much as digits as its factorization.

725245321 is an evil number, because the sum of its binary digits is even.

The product of its digits is 16800, while the sum is 31.

The square root of 725245321 is about 26930.3791469782. The cubic root of 725245321 is about 898.4522042777.

Adding to 725245321 its reverse (123542527), we get a palindrome (848787848).

The spelling of 725245321 in words is "seven hundred twenty-five million, two hundred forty-five thousand, three hundred twenty-one".