9659991 has 8 divisors (see below), whose sum is σ = 14050944. Its totient is φ = 5854520.

The previous prime is 9659989. The next prime is 9660019. The reversal of 9659991 is 1999569.

It is a happy number.

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 9659991 - 2¹ = 9659989 is a prime.

It is a super-2 number, since 2×9659991² = 186630852240162, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 9659991.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (9659911) 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, 146331 + ... + 146396.

It is an arithmetic number, because the mean of its divisors is an integer number (1756368).

Almost surely, 2^9659991 is an apocalyptic number.

9659991 is a deficient number, since it is larger than the sum of its proper divisors (4390953).

9659991 is a wasteful number, since it uses less digits than its factorization.

9659991 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 292741.

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

The square root of 9659991 is about 3108.0526057324. The cubic root of 9659991 is about 212.9735028424.

The spelling of 9659991 in words is "nine million, six hundred fifty-nine thousand, nine hundred ninety-one".