181000149 has 36 divisors (see below), whose sum is σ = 273567168. Its totient is φ = 106320720.

The previous prime is 181000129. The next prime is 181000163. The reversal of 181000149 is 941000181.

It is not a de Polignac number, because 181000149 - 2⁷ = 181000021 is a prime.

It is a super-2 number, since 2×181000149² = 65522107876044402, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (181000129) 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 35 ways as a sum of consecutive naturals, for example, 1757232 + ... + 1757334.

It is an arithmetic number, because the mean of its divisors is an integer number (7599088).

Almost surely, 2^181000149 is an apocalyptic number.

It is an amenable number.

181000149 is a deficient number, since it is larger than the sum of its proper divisors (92567019).

181000149 is a wasteful number, since it uses less digits than its factorization.

181000149 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 278 (or 164 counting only the distinct ones).

The product of its (nonzero) digits is 288, while the sum is 24.

The square root of 181000149 is about 13453.6295846140. The cubic root of 181000149 is about 565.6654378016.

The spelling of 181000149 in words is "one hundred eighty-one million, one hundred forty-nine", and thus it is an aban number.