181800274 has 4 divisors (see below), whose sum is σ = 272700414. Its totient is φ = 90900136.

The previous prime is 181800263. The next prime is 181800293. The reversal of 181800274 is 472008181.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 472008181 = 13681 ⋅34501.

It can be written as a sum of positive squares in only one way, i.e., 153636025 + 28164249 = 12395^2 + 5307^2 .

It is a Smith number, since the sum of its digits (31) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 45450067 + ... + 45450070.

Almost surely, 2^181800274 is an apocalyptic number.

181800274 is a deficient number, since it is larger than the sum of its proper divisors (90900140).

181800274 is an equidigital number, since it uses as much as digits as its factorization.

181800274 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 90900139.

The product of its (nonzero) digits is 3584, while the sum is 31.

The square root of 181800274 is about 13483.3331932427. Note that the first 3 decimals coincide. The cubic root of 181800274 is about 566.4977350342.

The spelling of 181800274 in words is "one hundred eighty-one million, eight hundred thousand, two hundred seventy-four".