721053 has 12 divisors (see below), whose sum is σ = 1052220. Its totient is φ = 475776.

The previous prime is 721051. The next prime is 721057. The reversal of 721053 is 350127.

It can be written as a sum of positive squares in 2 ways, for example, as 45369 + 675684 = 213^2 + 822^2 .

It is not a de Polignac number, because 721053 - 2¹ = 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 721053.

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, 663 + ... + 1371.

It is an arithmetic number, because the mean of its divisors is an integer number (87685).

2⁷²¹⁰⁵³ is an apocalyptic number.

It is an amenable number.

721053 is a deficient number, since it is larger than the sum of its proper divisors (331167).

721053 is a wasteful number, since it uses less digits than its factorization.

721053 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 828 (or 825 counting only the distinct ones).

The product of its (nonzero) digits is 210, while the sum is 18.

The square root of 721053 is about 849.1483969248. The cubic root of 721053 is about 89.6717673440.

The spelling of 721053 in words is "seven hundred twenty-one thousand, fifty-three".