181912149 has 20 divisors (see below), whose sum is σ = 272477964. Its totient is φ = 120947904.

The previous prime is 181912147. The next prime is 181912177. The reversal of 181912149 is 941219181.

It can be written as a sum of positive squares in 2 ways, for example, as 64883025 + 117029124 = 8055^2 + 10818^2 .

It is not a de Polignac number, because 181912149 - 2¹ = 181912147 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (181912141) by changing a digit.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 29329 + ... + 34985.

Almost surely, 2^181912149 is an apocalyptic number.

It is an amenable number.

181912149 is a deficient number, since it is larger than the sum of its proper divisors (90565815).

181912149 is an equidigital number, since it uses as much as digits as its factorization.

181912149 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6066 (or 6057 counting only the distinct ones).

The product of its digits is 5184, while the sum is 36.

The square root of 181912149 is about 13487.4811955383. The cubic root of 181912149 is about 566.6139136974.

The spelling of 181912149 in words is "one hundred eighty-one million, nine hundred twelve thousand, one hundred forty-nine".