181432149 has 16 divisors (see below), whose sum is σ = 251169600. Its totient is φ = 116355456.

The previous prime is 181432133. The next prime is 181432151. The reversal of 181432149 is 941234181.

It is a happy number.

It is not a de Polignac number, because 181432149 - 2⁴ = 181432133 is a prime.

It is an alternating number because its digits alternate between odd and even.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (181432129) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 20937 + ... + 28305.

It is an arithmetic number, because the mean of its divisors is an integer number (15698100).

Almost surely, 2^181432149 is an apocalyptic number.

It is an amenable number.

181432149 is a deficient number, since it is larger than the sum of its proper divisors (69737451).

181432149 is a wasteful number, since it uses less digits than its factorization.

181432149 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7684.

The product of its digits is 6912, while the sum is 33.

The square root of 181432149 is about 13469.6751631210. The cubic root of 181432149 is about 566.1151120406.

The spelling of 181432149 in words is "one hundred eighty-one million, four hundred thirty-two thousand, one hundred forty-nine".