721055 has 12 divisors (see below), whose sum is σ = 921000. Its totient is φ = 541824.

The previous prime is 721051. The next prime is 721057. The reversal of 721055 is 550127.

It is not a de Polignac number, because 721055 - 2² = 721051 is a prime.

It is a plaindrome in base 14.

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 721055.

It is not an unprimeable number, because it can be changed into a prime (721051) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1196 + ... + 1694.

It is an arithmetic number, because the mean of its divisors is an integer number (76750).

2⁷²¹⁰⁵⁵ is an apocalyptic number.

721055 is a deficient number, since it is larger than the sum of its proper divisors (199945).

721055 is a wasteful number, since it uses less digits than its factorization.

721055 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 538 (or 521 counting only the distinct ones).

The product of its (nonzero) digits is 350, while the sum is 20.

The square root of 721055 is about 849.1495745745. The cubic root of 721055 is about 89.6718502521.

The spelling of 721055 in words is "seven hundred twenty-one thousand, fifty-five".