81039226 has 8 divisors (see below), whose sum is σ = 123852564. Its totient is φ = 39755040.

The previous prime is 81039197. The next prime is 81039229. The reversal of 81039226 is 62293018.

It can be written as a sum of positive squares in 2 ways, for example, as 80550625 + 488601 = 8975^2 + 699^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is not an unprimeable number, because it can be changed into a prime (81039229) 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, 382155 + ... + 382366.

Almost surely, 2^81039226 is an apocalyptic number.

81039226 is a deficient number, since it is larger than the sum of its proper divisors (42813338).

81039226 is a wasteful number, since it uses less digits than its factorization.

81039226 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 764576.

The product of its (nonzero) digits is 5184, while the sum is 31.

The square root of 81039226 is about 9002.1789584522. The cubic root of 81039226 is about 432.7447038722.

The spelling of 81039226 in words is "eighty-one million, thirty-nine thousand, two hundred twenty-six".