1161999936 has 84 divisors (see below), whose sum is σ = 3335766252. Its totient is φ = 386740224.

The previous prime is 1161999913. The next prime is 1161999947. The reversal of 1161999936 is 6399991611.

1161999936 is a `hidden beast` number, since 11 + 619 + 9 + 9 + 9 + 3 + 6 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 72999936 + 1089000000 = 8544^2 + 33000^2 .

It is a nude number because it is divisible by every one of its digits.

It is an unprimeable number.

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, 538636 + ... + 540788.

It is an arithmetic number, because the mean of its divisors is an integer number (39711503).

Almost surely, 2^1161999936 is an apocalyptic number.

1161999936 is a gapful number since it is divisible by the number (16) 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 1161999936, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1667883126).

1161999936 is an abundant number, since it is smaller than the sum of its proper divisors (2173766316).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1161999936 is a wasteful number, since it uses less digits than its factorization.

1161999936 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3108 (or 3095 counting only the distinct ones).

The product of its digits is 708588, while the sum is 54.

The square root of 1161999936 is about 34088.1201593752. The cubic root of 1161999936 is about 1051.3210691579.

The spelling of 1161999936 in words is "one billion, one hundred sixty-one million, nine hundred ninety-nine thousand, nine hundred thirty-six".