721773133 has 8 divisors (see below), whose sum is σ = 737247096. Its totient is φ = 706368000.

The previous prime is 721773071. The next prime is 721773161. The reversal of 721773133 is 331377127.

It can be written as a sum of positive squares in 4 ways, for example, as 209294089 + 512479044 = 14467^2 + 22638^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 721773133 - 2¹³ = 721764941 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (721773163) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4273 + ... + 38233.

It is an arithmetic number, because the mean of its divisors is an integer number (92155887).

Almost surely, 2^721773133 is an apocalyptic number.

It is an amenable number.

721773133 is a deficient number, since it is larger than the sum of its proper divisors (15473963).

721773133 is a wasteful number, since it uses less digits than its factorization.

721773133 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 34415.

The product of its digits is 18522, while the sum is 34.

The square root of 721773133 is about 26865.8357956718. The cubic root of 721773133 is about 897.0160986279.

The spelling of 721773133 in words is "seven hundred twenty-one million, seven hundred seventy-three thousand, one hundred thirty-three".