1181100138 has 8 divisors (see below), whose sum is σ = 2362200288. Its totient is φ = 393700044.

The previous prime is 1181100131. The next prime is 1181100169. The reversal of 1181100138 is 8310011811.

It is a sphenic number, since it is the product of 3 distinct primes.

1181100138 is an admirable number.

It is not an unprimeable number, because it can be changed into a prime (1181100131) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 98425006 + ... + 98425017.

It is an arithmetic number, because the mean of its divisors is an integer number (295275036).

Almost surely, 2^1181100138 is an apocalyptic number.

1181100138 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

1181100138 is a wasteful number, since it uses less digits than its factorization.

1181100138 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 196850028.

The product of its (nonzero) digits is 192, while the sum is 24.

The square root of 1181100138 is about 34367.1374717185. The cubic root of 1181100138 is about 1057.0501043304.

Adding to 1181100138 its reverse (8310011811), we get a palindrome (9491111949).

The spelling of 1181100138 in words is "one billion, one hundred eighty-one million, one hundred thousand, one hundred thirty-eight".