7971911 has 2 divisors, whose sum is σ = 7971912. Its totient is φ = 7971910.

The previous prime is 7971881. The next prime is 7971913. The reversal of 7971911 is 1191797.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 7971911 - 2¹⁰ = 7970887 is a prime.

Together with 7971913, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (7971913) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3985955 + 3985956.

It is an arithmetic number, because the mean of its divisors is an integer number (3985956).

Almost surely, 2^7971911 is an apocalyptic number.

7971911 is a deficient number, since it is larger than the sum of its proper divisors (1).

7971911 is an equidigital number, since it uses as much as digits as its factorization.

7971911 is an evil number, because the sum of its binary digits is even.

The product of its digits is 3969, while the sum is 35.

The square root of 7971911 is about 2823.4572778776. The cubic root of 7971911 is about 199.7656505088.

The spelling of 7971911 in words is "seven million, nine hundred seventy-one thousand, nine hundred eleven".