724666421 has 2 divisors, whose sum is σ = 724666422. Its totient is φ = 724666420.

The previous prime is 724666373. The next prime is 724666457. The reversal of 724666421 is 124666427.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 650964196 + 73702225 = 25514^2 + 8585^2 .

It is a cyclic number.

It is not a de Polignac number, because 724666421 - 2¹⁴ = 724650037 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (724660421) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 362333210 + 362333211.

It is an arithmetic number, because the mean of its divisors is an integer number (362333211).

Almost surely, 2^724666421 is an apocalyptic number.

It is an amenable number.

724666421 is a deficient number, since it is larger than the sum of its proper divisors (1).

724666421 is an equidigital number, since it uses as much as digits as its factorization.

724666421 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 96768, while the sum is 38.

The square root of 724666421 is about 26919.6289164617. The cubic root of 724666421 is about 898.2130886687.

It can be divided in two parts, 72466 and 6421, that added together give a palindrome (78887).

The spelling of 724666421 in words is "seven hundred twenty-four million, six hundred sixty-six thousand, four hundred twenty-one".