9656991 has 6 divisors (see below), whose sum is σ = 13949000. Its totient is φ = 6437988.

The previous prime is 9656981. The next prime is 9657001. The reversal of 9656991 is 1996569.

It is an interprime number because it is at equal distance from previous prime (9656981) and next prime (9657001).

It is not a de Polignac number, because 9656991 - 2⁷ = 9656863 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (9656981) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 536491 + ... + 536508.

Almost surely, 2^9656991 is an apocalyptic number.

9656991 is a deficient number, since it is larger than the sum of its proper divisors (4292009).

9656991 is a wasteful number, since it uses less digits than its factorization.

9656991 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1073005 (or 1073002 counting only the distinct ones).

The product of its digits is 131220, while the sum is 45.

The square root of 9656991 is about 3107.5699509424. The cubic root of 9656991 is about 212.9514535928.

The spelling of 9656991 in words is "nine million, six hundred fifty-six thousand, nine hundred ninety-one".