1131165811 has 2 divisors, whose sum is σ = 1131165812. Its totient is φ = 1131165810.

The previous prime is 1131165797. The next prime is 1131165899. The reversal of 1131165811 is 1185611311.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 1131165811 - 2⁷ = 1131165683 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1131165811.

It is not a weakly prime, because it can be changed into another prime (1131165911) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 565582905 + 565582906.

It is an arithmetic number, because the mean of its divisors is an integer number (565582906).

Almost surely, 2^1131165811 is an apocalyptic number.

1131165811 is a deficient number, since it is larger than the sum of its proper divisors (1).

1131165811 is an equidigital number, since it uses as much as digits as its factorization.

1131165811 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 720, while the sum is 28.

The square root of 1131165811 is about 33632.8085505805. The cubic root of 1131165811 is about 1041.9385106343.

The spelling of 1131165811 in words is "one billion, one hundred thirty-one million, one hundred sixty-five thousand, eight hundred eleven".