9959691 has 16 divisors (see below), whose sum is σ = 15488000. Its totient is φ = 5690664.

The previous prime is 9959689. The next prime is 9959699. The reversal of 9959691 is 1969599.

It is a happy number.

It is not a de Polignac number, because 9959691 - 2¹ = 9959689 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 9959691.

It is not an unprimeable number, because it can be changed into a prime (9959699) 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, 3811 + ... + 5868.

It is an arithmetic number, because the mean of its divisors is an integer number (968000).

Almost surely, 2^9959691 is an apocalyptic number.

9959691 is a deficient number, since it is larger than the sum of its proper divisors (5528309).

9959691 is an equidigital number, since it uses as much as digits as its factorization.

9959691 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9703 (or 9689 counting only the distinct ones).

The product of its digits is 196830, while the sum is 48.

The square root of 9959691 is about 3155.8978120338. The cubic root of 9959691 is about 215.1536021524.

The spelling of 9959691 in words is "nine million, nine hundred fifty-nine thousand, six hundred ninety-one".