9721617 has 8 divisors (see below), whose sum is σ = 13525824. Its totient is φ = 6199248.

The previous prime is 9721609. The next prime is 9721643. The reversal of 9721617 is 7161279.

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

It is not a de Polignac number, because 9721617 - 2³ = 9721609 is a prime.

It is a Smith number, since the sum of its digits (33) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is not an unprimeable number, because it can be changed into a prime (9721667) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 70378 + ... + 70515.

It is an arithmetic number, because the mean of its divisors is an integer number (1690728).

Almost surely, 2^9721617 is an apocalyptic number.

It is an amenable number.

9721617 is a deficient number, since it is larger than the sum of its proper divisors (3804207).

9721617 is a wasteful number, since it uses less digits than its factorization.

9721617 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 140919.

The product of its digits is 5292, while the sum is 33.

The square root of 9721617 is about 3117.9507693355. The cubic root of 9721617 is about 213.4254319681.

The spelling of 9721617 in words is "nine million, seven hundred twenty-one thousand, six hundred seventeen".