725220449 has 2 divisors, whose sum is σ = 725220450. Its totient is φ = 725220448.

The previous prime is 725220437. The next prime is 725220451. The reversal of 725220449 is 944022527.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 663989824 + 61230625 = 25768^2 + 7825^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-725220449 is a prime.

Together with 725220451, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (725220409) 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, 362610224 + 362610225.

It is an arithmetic number, because the mean of its divisors is an integer number (362610225).

Almost surely, 2^725220449 is an apocalyptic number.

It is an amenable number.

725220449 is a deficient number, since it is larger than the sum of its proper divisors (1).

725220449 is an equidigital number, since it uses as much as digits as its factorization.

725220449 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 40320, while the sum is 35.

The square root of 725220449 is about 26929.9173596950. The cubic root of 725220449 is about 898.4419334732.

The spelling of 725220449 in words is "seven hundred twenty-five million, two hundred twenty thousand, four hundred forty-nine".