726036121 has 4 divisors (see below), whose sum is σ = 726624292. Its totient is φ = 725447952.

The previous prime is 726036061. The next prime is 726036133. The reversal of 726036121 is 121630627.

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 434138896 + 291897225 = 20836^2 + 17085^2 .

It is a cyclic number.

It is not a de Polignac number, because 726036121 - 2¹⁹ = 725511833 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 726036121.

It is not an unprimeable number, because it can be changed into a prime (726036161) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 292230 + ... + 294703.

It is an arithmetic number, because the mean of its divisors is an integer number (181656073).

Almost surely, 2^726036121 is an apocalyptic number.

It is an amenable number.

726036121 is a deficient number, since it is larger than the sum of its proper divisors (588171).

726036121 is a wasteful number, since it uses less digits than its factorization.

726036121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 588170.

The product of its (nonzero) digits is 3024, while the sum is 28.

The square root of 726036121 is about 26945.0574503006. The cubic root of 726036121 is about 898.7786399906.

Adding to 726036121 its reverse (121630627), we get a palindrome (847666748).

The spelling of 726036121 in words is "seven hundred twenty-six million, thirty-six thousand, one hundred twenty-one".