81271276 has 24 divisors (see below), whose sum is σ = 146334384. Its totient is φ = 39478080.

The previous prime is 81271241. The next prime is 81271297. The reversal of 81271276 is 67217218.

It is a happy 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 in 7 ways as a sum of consecutive naturals, for example, 18246 + ... + 22258.

It is an arithmetic number, because the mean of its divisors is an integer number (6097266).

Almost surely, 2^81271276 is an apocalyptic number.

It is an amenable number.

81271276 is a deficient number, since it is larger than the sum of its proper divisors (65063108).

81271276 is a wasteful number, since it uses less digits than its factorization.

81271276 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4161 (or 4159 counting only the distinct ones).

The product of its digits is 9408, while the sum is 34.

The square root of 81271276 is about 9015.0582915475. The cubic root of 81271276 is about 433.1573547110.

The spelling of 81271276 in words is "eighty-one million, two hundred seventy-one thousand, two hundred seventy-six".