1135123811 has 4 divisors (see below), whose sum is σ = 1135263000. Its totient is φ = 1134984624.

The previous prime is 1135123763. The next prime is 1135123817. The reversal of 1135123811 is 1183215311.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 1183215311 = 79 ⋅14977409.

It is a cyclic number.

It is not a de Polignac number, because 1135123811 - 2¹⁰ = 1135122787 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1135123817) 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, 56546 + ... + 73943.

It is an arithmetic number, because the mean of its divisors is an integer number (283815750).

Almost surely, 2^1135123811 is an apocalyptic number.

1135123811 is a deficient number, since it is larger than the sum of its proper divisors (139189).

1135123811 is an equidigital number, since it uses as much as digits as its factorization.

1135123811 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 139188.

The product of its digits is 720, while the sum is 26.

The square root of 1135123811 is about 33691.5985224803. The cubic root of 1135123811 is about 1043.1523591853.

The spelling of 1135123811 in words is "one billion, one hundred thirty-five million, one hundred twenty-three thousand, eight hundred eleven".