181136956 has 96 divisors (see below), whose sum is σ = 448197120. Its totient is φ = 61689600.

The previous prime is 181136953. The next prime is 181137007. The reversal of 181136956 is 659631181.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (181136953) by changing a digit.

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 31 ways as a sum of consecutive naturals, for example, 74886 + ... + 77266.

It is an arithmetic number, because the mean of its divisors is an integer number (4668720).

Almost surely, 2^181136956 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 181136956, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (224098560).

181136956 is an abundant number, since it is smaller than the sum of its proper divisors (267060164).

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

181136956 is a wasteful number, since it uses less digits than its factorization.

181136956 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2435 (or 2433 counting only the distinct ones).

The product of its digits is 38880, while the sum is 40.

The square root of 181136956 is about 13458.7130142521. The cubic root of 181136956 is about 565.8079192725.

The spelling of 181136956 in words is "one hundred eighty-one million, one hundred thirty-six thousand, nine hundred fifty-six".