726294521 has 2 divisors, whose sum is σ = 726294522. Its totient is φ = 726294520.

The previous prime is 726294511. The next prime is 726294533. The reversal of 726294521 is 125492627.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 621006400 + 105288121 = 24920^2 + 10261^2 .

It is a cyclic number.

It is not a de Polignac number, because 726294521 - 2²² = 722100217 is a prime.

It is not a weakly prime, because it can be changed into another prime (726294511) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 363147260 + 363147261.

It is an arithmetic number, because the mean of its divisors is an integer number (363147261).

Almost surely, 2^726294521 is an apocalyptic number.

It is an amenable number.

726294521 is a deficient number, since it is larger than the sum of its proper divisors (1).

726294521 is an equidigital number, since it uses as much as digits as its factorization.

726294521 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 60480, while the sum is 38.

The square root of 726294521 is about 26949.8519661983. The cubic root of 726294521 is about 898.8852539946.

It can be divided in two parts, 7262945 and 21, that multiplied together give a triangular number (152521845 = T₁₇₄₆₅).

The spelling of 726294521 in words is "seven hundred twenty-six million, two hundred ninety-four thousand, five hundred twenty-one".