721701 has 24 divisors (see below), whose sum is σ = 1137240. Its totient is φ = 439296.

The previous prime is 721697. The next prime is 721703. The reversal of 721701 is 107127.

Added to its reverse (107127) it gives a triangular number (828828 = T₁₂₈₇).

It can be written as a sum of positive squares in 4 ways, for example, as 159201 + 562500 = 399^2 + 750^2 .

It is not a de Polignac number, because 721701 - 2² = 721697 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (721703) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 8065 + ... + 8153.

It is an arithmetic number, because the mean of its divisors is an integer number (47385).

2⁷²¹⁷⁰¹ is an apocalyptic number.

It is an amenable number.

721701 is a deficient number, since it is larger than the sum of its proper divisors (415539).

721701 is a wasteful number, since it uses less digits than its factorization.

721701 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 165 (or 162 counting only the distinct ones).

The product of its (nonzero) digits is 98, while the sum is 18.

The square root of 721701 is about 849.5298699869. The cubic root of 721701 is about 89.6986215453.

Adding to 721701 its reverse (107127), we get a palindrome (828828).

The spelling of 721701 in words is "seven hundred twenty-one thousand, seven hundred one", and thus it is an iban number.