721275 has 24 divisors (see below), whose sum is σ = 1220160. Its totient is φ = 375840.

The previous prime is 721267. The next prime is 721283. The reversal of 721275 is 572127.

721275 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is an interprime number because it is at equal distance from previous prime (721267) and next prime (721283).

It is not a de Polignac number, because 721275 - 2³ = 721267 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 4344 + ... + 4506.

It is an arithmetic number, because the mean of its divisors is an integer number (50840).

2⁷²¹²⁷⁵ is an apocalyptic number.

721275 is a gapful number since it is divisible by the number (75) formed by its first and last digit.

721275 is a deficient number, since it is larger than the sum of its proper divisors (498885).

721275 is a wasteful number, since it uses less digits than its factorization.

721275 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 235 (or 230 counting only the distinct ones).

The product of its digits is 980, while the sum is 24.

The square root of 721275 is about 849.2791060658. The cubic root of 721275 is about 89.6809692056.

The spelling of 721275 in words is "seven hundred twenty-one thousand, two hundred seventy-five".