724121 has 2 divisors, whose sum is σ = 724122. Its totient is φ = 724120.

The previous prime is 724117. The next prime is 724123. The reversal of 724121 is 121427.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 697225 + 26896 = 835^2 + 164^2 .

It is a cyclic number.

It is not a de Polignac number, because 724121 - 2² = 724117 is a prime.

Together with 724123, it forms a pair of twin primes.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 724121.

It is not a weakly prime, because it can be changed into another prime (724123) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 362060 + 362061.

It is an arithmetic number, because the mean of its divisors is an integer number (362061).

2⁷²⁴¹²¹ is an apocalyptic number.

It is an amenable number.

724121 is a deficient number, since it is larger than the sum of its proper divisors (1).

724121 is an equidigital number, since it uses as much as digits as its factorization.

724121 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 112, while the sum is 17.

The square root of 724121 is about 850.9529951766. The cubic root of 724121 is about 89.7987685077.

Adding to 724121 its reverse (121427), we get a palindrome (845548).

The spelling of 724121 in words is "seven hundred twenty-four thousand, one hundred twenty-one", and thus it is an iban number.