8691971 has 2 divisors, whose sum is σ = 8691972. Its totient is φ = 8691970.

The previous prime is 8691961. The next prime is 8691973. The reversal of 8691971 is 1791968.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 8691971 - 2¹⁰ = 8690947 is a prime.

Together with 8691973, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (8691973) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4345985 + 4345986.

It is an arithmetic number, because the mean of its divisors is an integer number (4345986).

Almost surely, 2^8691971 is an apocalyptic number.

8691971 is a deficient number, since it is larger than the sum of its proper divisors (1).

8691971 is an equidigital number, since it uses as much as digits as its factorization.

8691971 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 27216, while the sum is 41.

The square root of 8691971 is about 2948.2148836203. The cubic root of 8691971 is about 205.6077227009.

The spelling of 8691971 in words is "eight million, six hundred ninety-one thousand, nine hundred seventy-one".