701721 has 6 divisors (see below), whose sum is σ = 1013610. Its totient is φ = 467808.

The previous prime is 701719. The next prime is 701731. The reversal of 701721 is 127107.

Added to its reverse (127107) it gives a triangular number (828828 = T₁₂₈₇).

701721 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in only one way, i.e., 632025 + 69696 = 795^2 + 264^2 .

It is not a de Polignac number, because 701721 - 2¹ = 701719 is a prime.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 701694 and 701703.

It is not an unprimeable number, because it can be changed into a prime (701711) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 38976 + ... + 38993.

It is an arithmetic number, because the mean of its divisors is an integer number (168935).

2⁷⁰¹⁷²¹ is an apocalyptic number.

It is an amenable number.

701721 is a deficient number, since it is larger than the sum of its proper divisors (311889).

701721 is a wasteful number, since it uses less digits than its factorization.

701721 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 77975 (or 77972 counting only the distinct ones).

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

The square root of 701721 is about 837.6878893717. The cubic root of 701721 is about 88.8631064692.

Adding to 701721 its reverse (127107), we get a palindrome (828828).

The spelling of 701721 in words is "seven hundred one thousand, seven hundred twenty-one", and thus it is an iban number.