81071226 has 32 divisors (see below), whose sum is σ = 180475200. Its totient is φ = 26976240.

The previous prime is 81071219. The next prime is 81071239. The reversal of 81071226 is 62217018.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a self number, because there is not a number n which added to its sum of digits gives 81071226.

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 15 ways as a sum of consecutive naturals, for example, 43861 + ... + 45671.

It is an arithmetic number, because the mean of its divisors is an integer number (5639850).

Almost surely, 2^81071226 is an apocalyptic number.

81071226 is an abundant number, since it is smaller than the sum of its proper divisors (99403974).

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

81071226 is a wasteful number, since it uses less digits than its factorization.

81071226 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2651 (or 2645 counting only the distinct ones).

The product of its (nonzero) digits is 1344, while the sum is 27.

The square root of 81071226 is about 9003.9561305017. The cubic root of 81071226 is about 432.8016557497.

The spelling of 81071226 in words is "eighty-one million, seventy-one thousand, two hundred twenty-six".