971511911 has 2 divisors, whose sum is σ = 971511912. Its totient is φ = 971511910.

The previous prime is 971511899. The next prime is 971511913. The reversal of 971511911 is 119115179.

971511911 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It is an emirp because it is prime and its reverse (119115179) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-971511911 is a prime.

Together with 971511913, 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 (971511913) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 485755955 + 485755956.

It is an arithmetic number, because the mean of its divisors is an integer number (485755956).

Almost surely, 2^971511911 is an apocalyptic number.

971511911 is a deficient number, since it is larger than the sum of its proper divisors (1).

971511911 is an equidigital number, since it uses as much as digits as its factorization.

971511911 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 2835, while the sum is 35.

The square root of 971511911 is about 31169.0858223336. The cubic root of 971511911 is about 990.4123409025.

The spelling of 971511911 in words is "nine hundred seventy-one million, five hundred eleven thousand, nine hundred eleven".