81022659 has 8 divisors (see below), whose sum is σ = 108627792. Its totient is φ = 53716320.

The previous prime is 81022649. The next prime is 81022679. The reversal of 81022659 is 95622018.

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

It is not a de Polignac number, because 81022659 - 2¹⁹ = 80498371 is a prime.

It is a Smith number, since the sum of its digits (33) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is not an unprimeable number, because it can be changed into a prime (81022649) by changing a digit.

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, 74064 + ... + 75149.

It is an arithmetic number, because the mean of its divisors is an integer number (13578474).

Almost surely, 2^81022659 is an apocalyptic number.

81022659 is a deficient number, since it is larger than the sum of its proper divisors (27605133).

81022659 is a wasteful number, since it uses less digits than its factorization.

81022659 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 149397.

The product of its (nonzero) digits is 8640, while the sum is 33.

The square root of 81022659 is about 9001.2587453089. The cubic root of 81022659 is about 432.7152129270.

The spelling of 81022659 in words is "eighty-one million, twenty-two thousand, six hundred fifty-nine".