1721606585 has 8 divisors (see below), whose sum is σ = 2081699136. Its totient is φ = 1366771120.

The previous prime is 1721606561. The next prime is 1721606597. The reversal of 1721606585 is 5856061271.

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

It is not a de Polignac number, because 1721606585 - 2⁸ = 1721606329 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1313549 + ... + 1314858.

It is an arithmetic number, because the mean of its divisors is an integer number (260212392).

Almost surely, 2^1721606585 is an apocalyptic number.

It is an amenable number.

1721606585 is a deficient number, since it is larger than the sum of its proper divisors (360092551).

1721606585 is a wasteful number, since it uses less digits than its factorization.

1721606585 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2628543.

The product of its (nonzero) digits is 100800, while the sum is 41.

The square root of 1721606585 is about 41492.2472878970. The cubic root of 1721606585 is about 1198.5182138353.

The spelling of 1721606585 in words is "one billion, seven hundred twenty-one million, six hundred six thousand, five hundred eighty-five".