1716941721 has 12 divisors (see below), whose sum is σ = 2516289776. Its totient is φ = 1040570520.

The previous prime is 1716941719. The next prime is 1716941729. The reversal of 1716941721 is 1271496171.

It is a happy number.

It is not a de Polignac number, because 1716941721 - 2¹ = 1716941719 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 1716941721.

It is not an unprimeable number, because it can be changed into a prime (1716941729) by changing a digit.

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 11 ways as a sum of consecutive naturals, for example, 2364571 + ... + 2365296.

Almost surely, 2^1716941721 is an apocalyptic number.

1716941721 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

1716941721 is a deficient number, since it is larger than the sum of its proper divisors (799348055).

1716941721 is a wasteful number, since it uses less digits than its factorization.

1716941721 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4729892 (or 4729881 counting only the distinct ones).

The product of its digits is 21168, while the sum is 39.

The square root of 1716941721 is about 41435.9954749491. The cubic root of 1716941721 is about 1197.4347332743.

The spelling of 1716941721 in words is "one billion, seven hundred sixteen million, nine hundred forty-one thousand, seven hundred twenty-one".