181798226 has 4 divisors (see below), whose sum is σ = 272697342. Its totient is φ = 90899112.

The previous prime is 181798219. The next prime is 181798237. The reversal of 181798226 is 622897181.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 622897181 = 53 ⋅11752777.

It can be written as a sum of positive squares in only one way, i.e., 179533201 + 2265025 = 13399^2 + 1505^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 45449555 + ... + 45449558.

Almost surely, 2^181798226 is an apocalyptic number.

181798226 is a deficient number, since it is larger than the sum of its proper divisors (90899116).

181798226 is an equidigital number, since it uses as much as digits as its factorization.

181798226 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 90899115.

The product of its digits is 96768, while the sum is 44.

The square root of 181798226 is about 13483.2572474161. The cubic root of 181798226 is about 566.4956078066.

The spelling of 181798226 in words is "one hundred eighty-one million, seven hundred ninety-eight thousand, two hundred twenty-six".