721133 has 6 divisors (see below), whose sum is σ = 838926. Its totient is φ = 618072.

The previous prime is 721129. The next prime is 721139. The reversal of 721133 is 331127.

It can be written as a sum of positive squares in only one way, i.e., 550564 + 170569 = 742^2 + 413^2 .

It is not a de Polignac number, because 721133 - 2² = 721129 is a prime.

It is a Duffinian number.

It is a Curzon 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 721133.

It is not an unprimeable number, because it can be changed into a prime (721139) 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, 7310 + ... + 7407.

It is an arithmetic number, because the mean of its divisors is an integer number (139821).

2⁷²¹¹³³ is an apocalyptic number.

It is an amenable number.

721133 is a deficient number, since it is larger than the sum of its proper divisors (117793).

721133 is a wasteful number, since it uses less digits than its factorization.

721133 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14731 (or 14724 counting only the distinct ones).

The product of its digits is 126, while the sum is 17.

The square root of 721133 is about 849.1955016367. The cubic root of 721133 is about 89.6750835478.

The spelling of 721133 in words is "seven hundred twenty-one thousand, one hundred thirty-three".