721271 has 4 divisors (see below), whose sum is σ = 726600. Its totient is φ = 715944.

The previous prime is 721267. The next prime is 721283. The reversal of 721271 is 172127.

721271 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 721271 - 2² = 721267 is a prime.

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 721271.

It is not an unprimeable number, because it can be changed into a prime (721261) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2456 + ... + 2733.

It is an arithmetic number, because the mean of its divisors is an integer number (181650).

2⁷²¹²⁷¹ is an apocalyptic number.

721271 is a deficient number, since it is larger than the sum of its proper divisors (5329).

721271 is a wasteful number, since it uses less digits than its factorization.

721271 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5328.

The product of its digits is 196, while the sum is 20.

The square root of 721271 is about 849.2767511242. The cubic root of 721271 is about 89.6808034230.

Adding to 721271 its reverse (172127), we get a palindrome (893398).

The spelling of 721271 in words is "seven hundred twenty-one thousand, two hundred seventy-one", and thus it is an iban number.