181471442 has 4 divisors (see below), whose sum is σ = 272207166. Its totient is φ = 90735720.

The previous prime is 181471439. The next prime is 181471457. The reversal of 181471442 is 244174181.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 244174181 = 11503 ⋅21227.

It can be written as a sum of positive squares in only one way, i.e., 114083761 + 67387681 = 10681^2 + 8209^2 .

It is a junction number, because it is equal to n+sod(n) for n = 181471399 and 181471408.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 45367859 + ... + 45367862.

Almost surely, 2^181471442 is an apocalyptic number.

181471442 is a deficient number, since it is larger than the sum of its proper divisors (90735724).

181471442 is an equidigital number, since it uses as much as digits as its factorization.

181471442 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 90735723.

The product of its digits is 7168, while the sum is 32.

The square root of 181471442 is about 13471.1336568234. The cubic root of 181471442 is about 566.1559771897.

The spelling of 181471442 in words is "one hundred eighty-one million, four hundred seventy-one thousand, four hundred forty-two".