725326421 has 2 divisors, whose sum is σ = 725326422. Its totient is φ = 725326420.

The previous prime is 725326409. The next prime is 725326447. The reversal of 725326421 is 124623527.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 465955396 + 259371025 = 21586^2 + 16105^2 .

It is a cyclic number.

It is not a de Polignac number, because 725326421 - 2¹⁰ = 725325397 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 (725326621) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 362663210 + 362663211.

It is an arithmetic number, because the mean of its divisors is an integer number (362663211).

Almost surely, 2^725326421 is an apocalyptic number.

It is an amenable number.

725326421 is a deficient number, since it is larger than the sum of its proper divisors (1).

725326421 is an equidigital number, since it uses as much as digits as its factorization.

725326421 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 20160, while the sum is 32.

The square root of 725326421 is about 26931.8848393498. The cubic root of 725326421 is about 898.4856926049.

Adding to 725326421 its reverse (124623527), we get a palindrome (849949948).

The spelling of 725326421 in words is "seven hundred twenty-five million, three hundred twenty-six thousand, four hundred twenty-one".