1161331020 is a `hidden beast` number, since 1 + 1 + 613 + 31 + 0 + 20 = 666.
It is an unprimeable number.
Almost surely, 21161331020 is an apocalyptic number.
1161331020 is a gapful number since it is divisible by the number (10) formed by its first and last digit.
It is an amenable number.
It is a practical number, because each smaller number is the sum of distinct divisors of 1161331020, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1849236480).
It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.
1161331020 is a wasteful number, since it uses less digits than its factorization.
1161331020 is an odious number, because the sum of its binary digits is odd.
The square root of 1161331020 is about 34078.3071762668. The cubic root of 1161331020 is about 1051.1192962062.
Adding to 1161331020 its reverse (201331611), we get a palindrome (1362662631).
The spelling of 1161331020 in words is "one billion, one hundred sixty-one million, three hundred thirty-one thousand, twenty".