9915691 has 8 divisors (see below), whose sum is σ = 10681344. Its totient is φ = 9177960.

The previous prime is 9915683. The next prime is 9915713. The reversal of 9915691 is 1965199.

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 9915691 - 2³ = 9915683 is a prime.

It is an Ulam number.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (9915391) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 6241 + ... + 7666.

It is an arithmetic number, because the mean of its divisors is an integer number (1335168).

Almost surely, 2^9915691 is an apocalyptic number.

9915691 is a deficient number, since it is larger than the sum of its proper divisors (765653).

9915691 is a wasteful number, since it uses less digits than its factorization.

9915691 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13961.

The product of its digits is 21870, while the sum is 40.

The square root of 9915691 is about 3148.9190208705. The cubic root of 9915691 is about 214.8362986811.

The spelling of 9915691 in words is "nine million, nine hundred fifteen thousand, six hundred ninety-one".