9917691 has 16 divisors (see below), whose sum is σ = 15197184. Its totient is φ = 5635584.

The previous prime is 9917689. The next prime is 9917701. The reversal of 9917691 is 1967199.

It is not a de Polignac number, because 9917691 - 2¹ = 9917689 is a prime.

It is not an unprimeable number, because it can be changed into a prime (9917641) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2830 + ... + 5276.

It is an arithmetic number, because the mean of its divisors is an integer number (949824).

Almost surely, 2^9917691 is an apocalyptic number.

9917691 is a deficient number, since it is larger than the sum of its proper divisors (5279493).

9917691 is a wasteful number, since it uses less digits than its factorization.

9917691 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2650.

The product of its digits is 30618, while the sum is 42.

The square root of 9917691 is about 3149.2365741557. The cubic root of 9917691 is about 214.8507419075.

The spelling of 9917691 in words is "nine million, nine hundred seventeen thousand, six hundred ninety-one".