181912226 has 4 divisors (see below), whose sum is σ = 272868342. Its totient is φ = 90956112.

The previous prime is 181912207. The next prime is 181912229. The reversal of 181912226 is 622219181.

181912226 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 622219181 = 197 ⋅3158473.

It can be written as a sum of positive squares in only one way, i.e., 161671225 + 20241001 = 12715^2 + 4499^2 .

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 181912192 and 181912201.

It is not an unprimeable number, because it can be changed into a prime (181912229) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 45478055 + ... + 45478058.

Almost surely, 2^181912226 is an apocalyptic number.

181912226 is a deficient number, since it is larger than the sum of its proper divisors (90956116).

181912226 is an equidigital number, since it uses as much as digits as its factorization.

181912226 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 90956115.

The product of its digits is 3456, while the sum is 32.

The square root of 181912226 is about 13487.4840500369. The cubic root of 181912226 is about 566.6139936431.

The spelling of 181912226 in words is "one hundred eighty-one million, nine hundred twelve thousand, two hundred twenty-six".