8181274 has 4 divisors (see below), whose sum is σ = 12271914. Its totient is φ = 4090636.

The previous prime is 8181269. The next prime is 8181281. The reversal of 8181274 is 4721818.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 7924225 + 257049 = 2815^2 + 507^2 .

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 Ulam number.

It is an alternating number because its digits alternate between even and odd.

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, 2045317 + ... + 2045320.

Almost surely, 2^8181274 is an apocalyptic number.

8181274 is a deficient number, since it is larger than the sum of its proper divisors (4090640).

8181274 is a wasteful number, since it uses less digits than its factorization.

8181274 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4090639.

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

The square root of 8181274 is about 2860.2926423707. The cubic root of 8181274 is about 201.4993483509.

The spelling of 8181274 in words is "eight million, one hundred eighty-one thousand, two hundred seventy-four".