9771691 has 2 divisors, whose sum is σ = 9771692. Its totient is φ = 9771690.

The previous prime is 9771689. The next prime is 9771703. The reversal of 9771691 is 1961779.

9771691 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 9771691 - 2¹ = 9771689 is a prime.

Together with 9771689, it forms a pair of twin primes.

It is a Chen prime.

It is an Ulam number.

It is not a weakly prime, because it can be changed into another prime (9771611) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4885845 + 4885846.

It is an arithmetic number, because the mean of its divisors is an integer number (4885846).

Almost surely, 2^9771691 is an apocalyptic number.

9771691 is a deficient number, since it is larger than the sum of its proper divisors (1).

9771691 is an equidigital number, since it uses as much as digits as its factorization.

9771691 is an evil number, because the sum of its binary digits is even.

The product of its digits is 23814, while the sum is 40.

The square root of 9771691 is about 3125.9704093289. The cubic root of 9771691 is about 213.7912410877.

The spelling of 9771691 in words is "nine million, seven hundred seventy-one thousand, six hundred ninety-one".