1171271011 has 4 divisors (see below), whose sum is σ = 1171344024. Its totient is φ = 1171198000.

The previous prime is 1171270993. The next prime is 1171271071. The reversal of 1171271011 is 1101721711.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length, and also an emirpimes, since its reverse is a distinct semiprime: 1101721711 = 4969 ⋅221719.

It is a cyclic number.

It is not a de Polignac number, because 1171271011 - 2¹¹ = 1171268963 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1171271071) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 805 + ... + 48406.

It is an arithmetic number, because the mean of its divisors is an integer number (292836006).

Almost surely, 2^1171271011 is an apocalyptic number.

1171271011 is a deficient number, since it is larger than the sum of its proper divisors (73013).

1171271011 is an equidigital number, since it uses as much as digits as its factorization.

1171271011 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 73012.

The product of its (nonzero) digits is 98, while the sum is 22.

The square root of 1171271011 is about 34223.8368830849. The cubic root of 1171271011 is about 1054.1096719483.

Adding to 1171271011 its reverse (1101721711), we get a palindrome (2272992722).

The spelling of 1171271011 in words is "one billion, one hundred seventy-one million, two hundred seventy-one thousand, eleven".