721241 has 8 divisors (see below), whose sum is σ = 751944. Its totient is φ = 691200.

The previous prime is 721229. The next prime is 721243. The reversal of 721241 is 142127.

It can be written as a sum of positive squares in 4 ways, for example, as 355216 + 366025 = 596^2 + 605^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 721241 - 2⁶ = 721177 is a prime.

It is a d-powerful number, because it can be written as 7³ + 2¹⁷ + 2¹⁹ + 1 + 4⁸ + 1 .

It is a Duffinian number.

It is a congruent number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 721241.

It is not an unprimeable number, because it can be changed into a prime (721243) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3641 + ... + 3833.

It is an arithmetic number, because the mean of its divisors is an integer number (93993).

2⁷²¹²⁴¹ is an apocalyptic number.

It is an amenable number.

721241 is a deficient number, since it is larger than the sum of its proper divisors (30703).

721241 is a wasteful number, since it uses less digits than its factorization.

721241 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 331.

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

The square root of 721241 is about 849.2590888533. The cubic root of 721241 is about 89.6795600339.

Adding to 721241 its reverse (142127), we get a palindrome (863368).

The spelling of 721241 in words is "seven hundred twenty-one thousand, two hundred forty-one", and thus it is an iban number.