81371244 has 24 divisors (see below), whose sum is σ = 190835568. Its totient is φ = 26985280.

The previous prime is 81371237. The next prime is 81371261. The reversal of 81371244 is 44217318.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 14847 + ... + 19574.

It is an arithmetic number, because the mean of its divisors is an integer number (7951482).

Almost surely, 2^81371244 is an apocalyptic number.

It is an amenable number.

81371244 is an abundant number, since it is smaller than the sum of its proper divisors (109464324).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

81371244 is a wasteful number, since it uses less digits than its factorization.

81371244 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 34625 (or 34623 counting only the distinct ones).

The product of its digits is 5376, while the sum is 30.

The square root of 81371244 is about 9020.6010886193. The cubic root of 81371244 is about 433.3348841496.

The spelling of 81371244 in words is "eighty-one million, three hundred seventy-one thousand, two hundred forty-four".