1161331011 has 12 divisors (see below), whose sum is σ = 1677792480. Its totient is φ = 774075600.

The previous prime is 1161331001. The next prime is 1161331049. The reversal of 1161331011 is 1101331611.

1161331011 is a `hidden beast` number, since 11 + 613 + 31 + 0 + 11 = 666.

It is not a de Polignac number, because 1161331011 - 2¹⁷ = 1161199939 is a prime.

It is a super-2 number, since 2×1161331011² = 2697379434220564242, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (1161331001) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 63445 + ... + 79673.

It is an arithmetic number, because the mean of its divisors is an integer number (139816040).

Almost surely, 2^1161331011 is an apocalyptic number.

1161331011 is a deficient number, since it is larger than the sum of its proper divisors (516461469).

1161331011 is a wasteful number, since it uses less digits than its factorization.

1161331011 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 24186 (or 24183 counting only the distinct ones).

The product of its (nonzero) digits is 54, while the sum is 18.

The square root of 1161331011 is about 34078.3070442180. The cubic root of 1161331011 is about 1051.1192934909.

Adding to 1161331011 its reverse (1101331611), we get a palindrome (2262662622).

It can be divided in two parts, 11613 and 31011, that added together give a palindrome (42624).

The spelling of 1161331011 in words is "one billion, one hundred sixty-one million, three hundred thirty-one thousand, eleven".