721741189 has 8 divisors (see below), whose sum is σ = 777533400. Its totient is φ = 665988096.

The previous prime is 721741177. The next prime is 721741247. The reversal of 721741189 is 981147127.

It can be written as a sum of positive squares in 4 ways, for example, as 10452289 + 711288900 = 3233^2 + 26670^2 .

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 721741189 - 2¹¹ = 721739141 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 (721741109) 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, 36789 + ... + 52885.

It is an arithmetic number, because the mean of its divisors is an integer number (97191675).

Almost surely, 2^721741189 is an apocalyptic number.

It is an amenable number.

721741189 is a deficient number, since it is larger than the sum of its proper divisors (55792211).

721741189 is a wasteful number, since it uses less digits than its factorization.

721741189 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19559.

The product of its digits is 28224, while the sum is 40.

The square root of 721741189 is about 26865.2412793930. The cubic root of 721741189 is about 897.0028651506.

The spelling of 721741189 in words is "seven hundred twenty-one million, seven hundred forty-one thousand, one hundred eighty-nine".