1711721645 has 8 divisors (see below), whose sum is σ = 2055373056. Its totient is φ = 1368505936.

The previous prime is 1711721633. The next prime is 1711721651. The reversal of 1711721645 is 5461271171.

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 1711721645 - 2¹⁶ = 1711656109 is a prime.

It is a super-4 number, since 4×1711721645⁴ (a number of 38 digits) contains 4444 as substring. Note that it is a super-d number also for d = 3.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 100217 + ... + 116046.

It is an arithmetic number, because the mean of its divisors is an integer number (256921632).

Almost surely, 2^1711721645 is an apocalyptic number.

It is an amenable number.

1711721645 is a deficient number, since it is larger than the sum of its proper divisors (343651411).

1711721645 is a wasteful number, since it uses less digits than its factorization.

1711721645 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 217851.

The product of its digits is 11760, while the sum is 35.

The square root of 1711721645 is about 41372.9578952243. The cubic root of 1711721645 is about 1196.2199675669.

The spelling of 1711721645 in words is "one billion, seven hundred eleven million, seven hundred twenty-one thousand, six hundred forty-five".