726045121 has 4 divisors (see below), whose sum is σ = 726765700. Its totient is φ = 725324544.

The previous prime is 726045059. The next prime is 726045127. The reversal of 726045121 is 121540627.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 205520896 + 520524225 = 14336^2 + 22815^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-726045121 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 726045121.

It is not an unprimeable number, because it can be changed into a prime (726045127) 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 in 3 ways as a sum of consecutive naturals, for example, 358776 + ... + 360793.

It is an arithmetic number, because the mean of its divisors is an integer number (181691425).

Almost surely, 2^726045121 is an apocalyptic number.

It is an amenable number.

726045121 is a deficient number, since it is larger than the sum of its proper divisors (720579).

726045121 is a wasteful number, since it uses less digits than its factorization.

726045121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 720578.

The product of its (nonzero) digits is 3360, while the sum is 28.

The square root of 726045121 is about 26945.2244562928. The cubic root of 726045121 is about 898.7823537518.

Adding to 726045121 its reverse (121540627), we get a palindrome (847585748).

The spelling of 726045121 in words is "seven hundred twenty-six million, forty-five thousand, one hundred twenty-one".