1161808011 has 24 divisors (see below), whose sum is σ = 2065437920. Its totient is φ = 612821376.

The previous prime is 1161807979. The next prime is 1161808027. The reversal of 1161808011 is 1108081611.

It is not a de Polignac number, because 1161808011 - 2⁵ = 1161807979 is a prime.

It is a super-2 number, since 2×1161808011² = 2699595708847552242, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (1161808061) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 708466 + ... + 710103.

Almost surely, 2^1161808011 is an apocalyptic number.

1161808011 is a deficient number, since it is larger than the sum of its proper divisors (903629909).

1161808011 is a wasteful number, since it uses less digits than its factorization.

1161808011 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1418595 (or 1418592 counting only the distinct ones).

The product of its (nonzero) digits is 384, while the sum is 27.

The square root of 1161808011 is about 34085.3049128213. The cubic root of 1161808011 is about 1051.2631845000.

Adding to 1161808011 its reverse (1108081611), we get a palindrome (2269889622).

The spelling of 1161808011 in words is "one billion, one hundred sixty-one million, eight hundred eight thousand, eleven".