726253621 has 2 divisors, whose sum is σ = 726253622. Its totient is φ = 726253620.

The previous prime is 726253613. The next prime is 726253637. The reversal of 726253621 is 126352627.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 718990596 + 7263025 = 26814^2 + 2695^2 .

It is an emirp because it is prime and its reverse (126352627) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 726253621 - 2³ = 726253613 is a prime.

It is a super-2 number, since 2×726253621² = 1054888644031223282, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (726253601) 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, 363126810 + 363126811.

It is an arithmetic number, because the mean of its divisors is an integer number (363126811).

Almost surely, 2^726253621 is an apocalyptic number.

It is an amenable number.

726253621 is a deficient number, since it is larger than the sum of its proper divisors (1).

726253621 is an equidigital number, since it uses as much as digits as its factorization.

726253621 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 30240, while the sum is 34.

The square root of 726253621 is about 26949.0931387310. The cubic root of 726253621 is about 898.8683806299.

The spelling of 726253621 in words is "seven hundred twenty-six million, two hundred fifty-three thousand, six hundred twenty-one".