181229138 has 8 divisors (see below), whose sum is σ = 271971840. Its totient is φ = 90571860.

The previous prime is 181229117. The next prime is 181229183. The reversal of 181229138 is 831922181.

181229138 is digitally balanced in base 2 and base 3, because in such bases it contains all the possibile digits an equal number of times.

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

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 181229098 and 181229107.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 15758 + ... + 24713.

It is an arithmetic number, because the mean of its divisors is an integer number (33996480).

Almost surely, 2^181229138 is an apocalyptic number.

181229138 is a deficient number, since it is larger than the sum of its proper divisors (90742702).

181229138 is a wasteful number, since it uses less digits than its factorization.

181229138 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 42712.

The product of its digits is 6912, while the sum is 35.

The square root of 181229138 is about 13462.1372003111. The cubic root of 181229138 is about 565.9038843395.

The spelling of 181229138 in words is "one hundred eighty-one million, two hundred twenty-nine thousand, one hundred thirty-eight".