181813226 has 12 divisors (see below), whose sum is σ = 317245698. Its totient is φ = 77919912.

The previous prime is 181813217. The next prime is 181813309. The reversal of 181813226 is 622318181.

It can be written as a sum of positive squares in only one way, i.e., 98109025 + 83704201 = 9905^2 + 9149^2 .

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 181813192 and 181813201.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 927521 + ... + 927716.

Almost surely, 2^181813226 is an apocalyptic number.

181813226 is a deficient number, since it is larger than the sum of its proper divisors (135432472).

181813226 is a wasteful number, since it uses less digits than its factorization.

181813226 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1855253 (or 1855246 counting only the distinct ones).

The product of its digits is 4608, while the sum is 32.

The square root of 181813226 is about 13483.8134813561. The cubic root of 181813226 is about 566.5111877174.

The spelling of 181813226 in words is "one hundred eighty-one million, eight hundred thirteen thousand, two hundred twenty-six".