1161330081 has 4 divisors (see below), whose sum is σ = 1548440112. Its totient is φ = 774220052.

The previous prime is 1161330073. The next prime is 1161330083. The reversal of 1161330081 is 1800331611.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 1161330081 - 2³ = 1161330073 is a prime.

It is a super-2 number, since 2×1161330081² = 2697375114070933122, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (1161330083) 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, 193555011 + ... + 193555016.

It is an arithmetic number, because the mean of its divisors is an integer number (387110028).

Almost surely, 2^1161330081 is an apocalyptic number.

It is an amenable number.

1161330081 is a deficient number, since it is larger than the sum of its proper divisors (387110031).

1161330081 is an equidigital number, since it uses as much as digits as its factorization.

1161330081 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 387110030.

The product of its (nonzero) digits is 432, while the sum is 24.

The square root of 1161330081 is about 34078.2933991713. The cubic root of 1161330081 is about 1051.1190129102.

Adding to 1161330081 its reverse (1800331611), we get a palindrome (2961661692).

The spelling of 1161330081 in words is "one billion, one hundred sixty-one million, three hundred thirty thousand, eighty-one".