11971274771 has 2 divisors, whose sum is σ = 11971274772. Its totient is φ = 11971274770.

The previous prime is 11971274747. The next prime is 11971274789. The reversal of 11971274771 is 17747217911.

It is a happy number.

It is a strong prime.

It is an emirp because it is prime and its reverse (17747217911) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-11971274771 is a prime.

It is a super-2 number, since 2×11971274771² (a number of 21 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (11971274741) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5985637385 + 5985637386.

It is an arithmetic number, because the mean of its divisors is an integer number (5985637386).

Almost surely, 2^11971274771 is an apocalyptic number.

11971274771 is a deficient number, since it is larger than the sum of its proper divisors (1).

11971274771 is an equidigital number, since it uses as much as digits as its factorization.

11971274771 is an evil number, because the sum of its binary digits is even.

The product of its digits is 172872, while the sum is 47.

The spelling of 11971274771 in words is "eleven billion, nine hundred seventy-one million, two hundred seventy-four thousand, seven hundred seventy-one".