1165506011 has 4 divisors (see below), whose sum is σ = 1165607400. Its totient is φ = 1165404624.

The previous prime is 1165506007. The next prime is 1165506049. The reversal of 1165506011 is 1106055611.

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.

It is a cyclic number.

It is not a de Polignac number, because 1165506011 - 2² = 1165506007 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1165506211) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 30866 + ... + 57303.

It is an arithmetic number, because the mean of its divisors is an integer number (291401850).

Almost surely, 2^1165506011 is an apocalyptic number.

1165506011 is a deficient number, since it is larger than the sum of its proper divisors (101389).

1165506011 is an equidigital number, since it uses as much as digits as its factorization.

1165506011 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 101388.

The product of its (nonzero) digits is 900, while the sum is 26.

The square root of 1165506011 is about 34139.5080661687. The cubic root of 1165506011 is about 1052.3773828942.

The spelling of 1165506011 in words is "one billion, one hundred sixty-five million, five hundred six thousand, eleven".