726899009281 has 2 divisors, whose sum is σ = 726899009282. Its totient is φ = 726899009280.

The previous prime is 726899009251. The next prime is 726899009293. The reversal of 726899009281 is 182900998627.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 706675609600 + 20223399681 = 840640^2 + 142209^2 .

It is an emirp because it is prime and its reverse (182900998627) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 726899009281 - 2¹⁹ = 726898484993 is a prime.

It is a super-2 number, since 2×726899009281² (a number of 25 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (726899009251) 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, 363449504640 + 363449504641.

It is an arithmetic number, because the mean of its divisors is an integer number (363449504641).

Almost surely, 2^726899009281 is an apocalyptic number.

It is an amenable number.

726899009281 is a deficient number, since it is larger than the sum of its proper divisors (1).

726899009281 is an equidigital number, since it uses as much as digits as its factorization.

726899009281 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 7838208, while the sum is 61.

The spelling of 726899009281 in words is "seven hundred twenty-six billion, eight hundred ninety-nine million, nine thousand, two hundred eighty-one".