181478889 has 6 divisors (see below), whose sum is σ = 262136186. Its totient is φ = 120985920.

The previous prime is 181478863. The next prime is 181478933. The reversal of 181478889 is 988874181.

It is a happy number.

181478889 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in only one way, i.e., 176225625 + 5253264 = 13275^2 + 2292^2 .

It is not a de Polignac number, because 181478889 - 2⁷ = 181478761 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (181478389) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 10082152 + ... + 10082169.

Almost surely, 2^181478889 is an apocalyptic number.

It is an amenable number.

181478889 is a deficient number, since it is larger than the sum of its proper divisors (80657297).

181478889 is a wasteful number, since it uses less digits than its factorization.

181478889 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20164327 (or 20164324 counting only the distinct ones).

The product of its digits is 1032192, while the sum is 54.

The square root of 181478889 is about 13471.4100598267. The cubic root of 181478889 is about 566.1637214861.

The spelling of 181478889 in words is "one hundred eighty-one million, four hundred seventy-eight thousand, eight hundred eighty-nine".