81271244 has 12 divisors (see below), whose sum is σ = 142602600. Its totient is φ = 40527648.

The previous prime is 81271241. The next prime is 81271297. The reversal of 81271244 is 44217218.

It is not an unprimeable number, because it can be changed into a prime (81271241) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 25289 + ... + 28320.

It is an arithmetic number, because the mean of its divisors is an integer number (11883550).

Almost surely, 2^81271244 is an apocalyptic number.

It is an amenable number.

81271244 is a deficient number, since it is larger than the sum of its proper divisors (61331356).

81271244 is a wasteful number, since it uses less digits than its factorization.

81271244 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 53992 (or 53990 counting only the distinct ones).

The product of its digits is 3584, while the sum is 29.

The square root of 81271244 is about 9015.0565167391. The cubic root of 81271244 is about 433.1572978601.

The spelling of 81271244 in words is "eighty-one million, two hundred seventy-one thousand, two hundred forty-four".