181331229 has 16 divisors (see below), whose sum is σ = 250948800. Its totient is φ = 116328576.

The previous prime is 181331209. The next prime is 181331243. The reversal of 181331229 is 922133181.

It is not a de Polignac number, because 181331229 - 2¹⁵ = 181298461 is a prime.

It is a super-2 number, since 2×181331229² = 65762029221300882, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 181331196 and 181331205.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (181331209) 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, 23902 + ... + 30560.

It is an arithmetic number, because the mean of its divisors is an integer number (15684300).

Almost surely, 2^181331229 is an apocalyptic number.

It is an amenable number.

181331229 is a deficient number, since it is larger than the sum of its proper divisors (69617571).

181331229 is a wasteful number, since it uses less digits than its factorization.

181331229 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7004.

The product of its digits is 2592, while the sum is 30.

The square root of 181331229 is about 13465.9284492381. The cubic root of 181331229 is about 566.0101270939.

The spelling of 181331229 in words is "one hundred eighty-one million, three hundred thirty-one thousand, two hundred twenty-nine".