181881054 has 48 divisors (see below), whose sum is σ = 406525392. Its totient is φ = 58740864.

The previous prime is 181881041. The next prime is 181881059. The reversal of 181881054 is 450188181.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (181881059) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 78034 + ... + 80330.

It is an arithmetic number, because the mean of its divisors is an integer number (8469279).

Almost surely, 2^181881054 is an apocalyptic number.

181881054 is an abundant number, since it is smaller than the sum of its proper divisors (224644338).

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

181881054 is a wasteful number, since it uses less digits than its factorization.

181881054 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2441 (or 2438 counting only the distinct ones).

The product of its (nonzero) digits is 10240, while the sum is 36.

The square root of 181881054 is about 13486.3284106535. The cubic root of 181881054 is about 566.5816273003.

The spelling of 181881054 in words is "one hundred eighty-one million, eight hundred eighty-one thousand, fifty-four".