721201 has 8 divisors (see below), whose sum is σ = 803880. Its totient is φ = 642432.

The previous prime is 721199. The next prime is 721207. The reversal of 721201 is 102127.

721201 = 600² + 601².

It can be written as a sum of positive squares in 4 ways, for example, as 119025 + 602176 = 345^2 + 776^2 .

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 721201 - 2¹ = 721199 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (13).

It is not an unprimeable number, because it can be changed into a prime (721207) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 580 + ... + 1333.

It is an arithmetic number, because the mean of its divisors is an integer number (100485).

2⁷²¹²⁰¹ is an apocalyptic number.

721201 is the 601-st centered square number.

It is an amenable number.

721201 is a deficient number, since it is larger than the sum of its proper divisors (82679).

721201 is a wasteful number, since it uses less digits than its factorization.

721201 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1955.

The product of its (nonzero) digits is 28, while the sum is 13.

The square root of 721201 is about 849.2355385875. The cubic root of 721201 is about 89.6779021282.

Adding to 721201 its reverse (102127), we get a palindrome (823328).

The spelling of 721201 in words is "seven hundred twenty-one thousand, two hundred one", and thus it is an iban number.