9768991 has 4 divisors (see below), whose sum is σ = 9811152. Its totient is φ = 9726832.

The previous prime is 9768973. The next prime is 9769003. The reversal of 9768991 is 1998679.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 9768991 - 2¹⁷ = 9637919 is a prime.

It is an Ulam number.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (9768901) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 20731 + ... + 21196.

It is an arithmetic number, because the mean of its divisors is an integer number (2452788).

Almost surely, 2^9768991 is an apocalyptic number.

9768991 is a deficient number, since it is larger than the sum of its proper divisors (42161).

9768991 is a wasteful number, since it uses less digits than its factorization.

9768991 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 42160.

The product of its digits is 244944, while the sum is 49.

The square root of 9768991 is about 3125.5385136005. The cubic root of 9768991 is about 213.7715485041.

The spelling of 9768991 in words is "nine million, seven hundred sixty-eight thousand, nine hundred ninety-one".