721361589 has 16 divisors (see below), whose sum is σ = 1036994112. Its totient is φ = 443403648.

The previous prime is 721361551. The next prime is 721361591. The reversal of 721361589 is 985163127.

It is not a de Polignac number, because 721361589 - 2¹⁵ = 721328821 is a prime.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 721361589.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (721361519) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 25177 + ... + 45569.

It is an arithmetic number, because the mean of its divisors is an integer number (64812132).

Almost surely, 2^721361589 is an apocalyptic number.

It is an amenable number.

721361589 is a deficient number, since it is larger than the sum of its proper divisors (315632523).

721361589 is a wasteful number, since it uses less digits than its factorization.

721361589 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21316.

The product of its digits is 90720, while the sum is 42.

The square root of 721361589 is about 26858.1754592526. The cubic root of 721361589 is about 896.8455779282.

The spelling of 721361589 in words is "seven hundred twenty-one million, three hundred sixty-one thousand, five hundred eighty-nine".