81274 has 4 divisors (see below), whose sum is σ = 121914. Its totient is φ = 40636.

The previous prime is 81239. The next prime is 81281. The reversal of 81274 is 47218.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 47218 = 2 ⋅23609.

It can be written as a sum of positive squares in only one way, i.e., 81225 + 49 = 285^2 + 7^2 .

It is a Smith number, since the sum of its digits (22) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax 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 (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 20317 + ... + 20320.

2⁸¹²⁷⁴ is an apocalyptic number.

81274 is a deficient number, since it is larger than the sum of its proper divisors (40640).

81274 is a wasteful number, since it uses less digits than its factorization.

81274 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 40639.

The product of its digits is 448, while the sum is 22.

The square root of 81274 is about 285.0859519513. The cubic root of 81274 is about 43.3162194090.

The spelling of 81274 in words is "eighty-one thousand, two hundred seventy-four".