181071228 has 24 divisors (see below), whose sum is σ = 454999888. Its totient is φ = 55714176.

The previous prime is 181071181. The next prime is 181071263. The reversal of 181071228 is 822170181.

It is a happy number.

It is a super-3 number, since 3×181071228³ (a number of 26 digits) contains 333 as substring.

It is a Smith number, since the sum of its digits (30) coincides with the sum of the digits of its prime factors.

It is a junction number, because it is equal to n+sod(n) for n = 181071195 and 181071204.

It is a congruent number.

It is an unprimeable number.

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 7 ways as a sum of consecutive naturals, for example, 580201 + ... + 580512.

Almost surely, 2^181071228 is an apocalyptic number.

It is an amenable number.

181071228 is an abundant number, since it is smaller than the sum of its proper divisors (273928660).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

181071228 is a wasteful number, since it uses less digits than its factorization.

181071228 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1160733 (or 1160731 counting only the distinct ones).

The product of its (nonzero) digits is 1792, while the sum is 30.

The square root of 181071228 is about 13456.2709544658. The cubic root of 181071228 is about 565.7394739685.

The spelling of 181071228 in words is "one hundred eighty-one million, seventy-one thousand, two hundred twenty-eight".