9828721117 has 4 divisors (see below), whose sum is σ = 9838720800. Its totient is φ = 9818721436.

The previous prime is 9828721081. The next prime is 9828721121. The reversal of 9828721117 is 7111278289.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 7111278289 = 41611 ⋅170899.

It is a cyclic number.

It is not a de Polignac number, because 9828721117 - 2⁷ = 9828720989 is a prime.

It is a super-3 number, since 3×9828721117³ (a number of 31 digits) contains 333 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (9828724117) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4998367 + ... + 5000332.

It is an arithmetic number, because the mean of its divisors is an integer number (2459680200).

Almost surely, 2^9828721117 is an apocalyptic number.

It is an amenable number.

9828721117 is a deficient number, since it is larger than the sum of its proper divisors (9999683).

9828721117 is an equidigital number, since it uses as much as digits as its factorization.

9828721117 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9999682.

The product of its digits is 112896, while the sum is 46.

The square root of 9828721117 is about 99139.9067832929. The cubic root of 9828721117 is about 2142.0634824084.

The spelling of 9828721117 in words is "nine billion, eight hundred twenty-eight million, seven hundred twenty-one thousand, one hundred seventeen".