181999149000 has 128 divisors (see below), whose sum is σ = 568326844800. Its totient is φ = 48491270400.

The previous prime is 181999148977. The next prime is 181999149019. The reversal of 181999149000 is 941999181.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 3535446 + ... + 3586554.

It is an arithmetic number, because the mean of its divisors is an integer number (4440053475).

Almost surely, 2^181999149000 is an apocalyptic number.

181999149000 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 181999149000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (284163422400).

181999149000 is an abundant number, since it is smaller than the sum of its proper divisors (386327695800).

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

181999149000 is a wasteful number, since it uses less digits than its factorization.

181999149000 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 52320 (or 52306 counting only the distinct ones).

The product of its (nonzero) digits is 209952, while the sum is 51.

The spelling of 181999149000 in words is "one hundred eighty-one billion, nine hundred ninety-nine million, one hundred forty-nine thousand".