1131121611 has 16 divisors (see below), whose sum is σ = 1678734720. Its totient is φ = 752731560.

The previous prime is 1131121573. The next prime is 1131121631. The reversal of 1131121611 is 1161211311.

1131121611 is a `hidden beast` number, since 1 + 1 + 31 + 1 + 21 + 611 = 666.

It is not a de Polignac number, because 1131121611 - 2⁹ = 1131121099 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1131121631) 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 15 ways as a sum of consecutive naturals, for example, 22005 + ... + 52406.

It is an arithmetic number, because the mean of its divisors is an integer number (104920920).

Almost surely, 2^1131121611 is an apocalyptic number.

1131121611 is a deficient number, since it is larger than the sum of its proper divisors (547613109).

1131121611 is an equidigital number, since it uses as much as digits as its factorization.

1131121611 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 74983 (or 74977 counting only the distinct ones).

The product of its digits is 36, while the sum is 18.

The square root of 1131121611 is about 33632.1514476847. The cubic root of 1131121611 is about 1041.9249393018.

Adding to 1131121611 its reverse (1161211311), we get a palindrome (2292332922).

The spelling of 1131121611 in words is "one billion, one hundred thirty-one million, one hundred twenty-one thousand, six hundred eleven".