1161881136 has 60 divisors (see below), whose sum is σ = 3501786288. Its totient is φ = 357501312.

The previous prime is 1161881117. The next prime is 1161881153. The reversal of 1161881136 is 6311881611.

1161881136 is a `hidden beast` number, since 1 + 1 + 618 + 8 + 1 + 1 + 36 = 666.

It is a Harshad number since it is a multiple of its sum of digits (36).

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

It is a self number, because there is not a number n which added to its sum of digits gives 1161881136.

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, 308460 + ... + 312203.

Almost surely, 2^1161881136 is an apocalyptic number.

1161881136 is a gapful number since it is divisible by the number (16) formed by its first and last digit.

It is an amenable number.

1161881136 is an abundant number, since it is smaller than the sum of its proper divisors (2339905152).

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

1161881136 is a wasteful number, since it uses less digits than its factorization.

1161881136 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 620690 (or 620681 counting only the distinct ones).

The product of its digits is 6912, while the sum is 36.

The square root of 1161881136 is about 34086.3775722795. The cubic root of 1161881136 is about 1051.2852397814.

The spelling of 1161881136 in words is "one billion, one hundred sixty-one million, eight hundred eighty-one thousand, one hundred thirty-six".