971228911 has 2 divisors, whose sum is σ = 971228912. Its totient is φ = 971228910.

The previous prime is 971228849. The next prime is 971228941. The reversal of 971228911 is 119822179.

It is a strong prime.

It is an emirp because it is prime and its reverse (119822179) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 971228911 - 2⁹ = 971228399 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (971228941) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 485614455 + 485614456.

It is an arithmetic number, because the mean of its divisors is an integer number (485614456).

Almost surely, 2^971228911 is an apocalyptic number.

971228911 is a deficient number, since it is larger than the sum of its proper divisors (1).

971228911 is an equidigital number, since it uses as much as digits as its factorization.

971228911 is an evil number, because the sum of its binary digits is even.

The product of its digits is 18144, while the sum is 40.

The square root of 971228911 is about 31164.5457371032. The cubic root of 971228911 is about 990.3161630072.

The spelling of 971228911 in words is "nine hundred seventy-one million, two hundred twenty-eight thousand, nine hundred eleven".