181641849 has 16 divisors (see below), whose sum is σ = 250012224. Its totient is φ = 117228800.

The previous prime is 181641841. The next prime is 181641871. The reversal of 181641849 is 948146181.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 181641849 - 2³ = 181641841 is a prime.

It is a super-2 number, since 2×181641849² = 65987522616277602, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 181641849.

It is not an unprimeable number, because it can be changed into a prime (181641841) 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, 10477 + ... + 21749.

It is an arithmetic number, because the mean of its divisors is an integer number (15625764).

Almost surely, 2^181641849 is an apocalyptic number.

It is an amenable number.

181641849 is a deficient number, since it is larger than the sum of its proper divisors (68370375).

181641849 is a wasteful number, since it uses less digits than its factorization.

181641849 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11448.

The product of its digits is 55296, while the sum is 42.

The square root of 181641849 is about 13477.4570672661. The cubic root of 181641849 is about 566.3331340986. Note that the first 3 decimals are identical.

The spelling of 181641849 in words is "one hundred eighty-one million, six hundred forty-one thousand, eight hundred forty-nine".