1181155120 has 40 divisors (see below), whose sum is σ = 2804624064. Its totient is φ = 462408192.

The previous prime is 1181155109. The next prime is 1181155169. The reversal of 1181155120 is 215511811.

It is a tau number, because it is divible by the number of its divisors (40).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 153309 + ... + 160828.

Almost surely, 2^1181155120 is an apocalyptic number.

1181155120 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1181155120 is an abundant number, since it is smaller than the sum of its proper divisors (1623468944).

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

1181155120 is a wasteful number, since it uses less digits than its factorization.

1181155120 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 314197 (or 314191 counting only the distinct ones).

The product of its (nonzero) digits is 400, while the sum is 25.

The square root of 1181155120 is about 34367.9373835556. The cubic root of 1181155120 is about 1057.0665065036.

Adding to 1181155120 its reverse (215511811), we get a palindrome (1396666931).

The spelling of 1181155120 in words is "one billion, one hundred eighty-one million, one hundred fifty-five thousand, one hundred twenty".