724720121 has 16 divisors (see below), whose sum is σ = 758419200. Its totient is φ = 691656000.

The previous prime is 724720111. The next prime is 724720127. The reversal of 724720121 is 121027427.

It is a cyclic number.

It is not a de Polignac number, because 724720121 - 2¹⁴ = 724703737 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (724720127) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1571831 + ... + 1572291.

It is an arithmetic number, because the mean of its divisors is an integer number (47401200).

Almost surely, 2^724720121 is an apocalyptic number.

It is an amenable number.

724720121 is a deficient number, since it is larger than the sum of its proper divisors (33699079).

724720121 is a wasteful number, since it uses less digits than its factorization.

724720121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1000.

The product of its (nonzero) digits is 1568, while the sum is 26.

The square root of 724720121 is about 26920.6263114364. The cubic root of 724720121 is about 898.2352749005.

Adding to 724720121 its reverse (121027427), we get a palindrome (845747548).

The spelling of 724720121 in words is "seven hundred twenty-four million, seven hundred twenty thousand, one hundred twenty-one".