724395481 has 2 divisors, whose sum is σ = 724395482. Its totient is φ = 724395480.

The previous prime is 724395439. The next prime is 724395487. The reversal of 724395481 is 184593427.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 514609225 + 209786256 = 22685^2 + 14484^2 .

It is an emirp because it is prime and its reverse (184593427) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 724395481 - 2¹¹ = 724393433 is a prime.

It is a super-2 number, since 2×724395481² = 1049497625786442722, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (724395487) 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, 362197740 + 362197741.

It is an arithmetic number, because the mean of its divisors is an integer number (362197741).

Almost surely, 2^724395481 is an apocalyptic number.

It is an amenable number.

724395481 is a deficient number, since it is larger than the sum of its proper divisors (1).

724395481 is an equidigital number, since it uses as much as digits as its factorization.

724395481 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 241920, while the sum is 43.

The square root of 724395481 is about 26914.5960586445. The cubic root of 724395481 is about 898.1011327016.

The spelling of 724395481 in words is "seven hundred twenty-four million, three hundred ninety-five thousand, four hundred eighty-one".