81159055 has 8 divisors (see below), whose sum is σ = 98355744. Its totient is φ = 64284000.

The previous prime is 81159031. The next prime is 81159077. The reversal of 81159055 is 55095118.

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

It is not a de Polignac number, because 81159055 - 2⁹ = 81158543 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 81159055.

It is a congruent number.

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, 79851 + ... + 80860.

It is an arithmetic number, because the mean of its divisors is an integer number (12294468).

Almost surely, 2^81159055 is an apocalyptic number.

81159055 is a deficient number, since it is larger than the sum of its proper divisors (17196689).

81159055 is a wasteful number, since it uses less digits than its factorization.

81159055 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 160817.

The product of its (nonzero) digits is 9000, while the sum is 34.

The square root of 81159055 is about 9008.8320552667. The cubic root of 81159055 is about 432.9578921018.

The spelling of 81159055 in words is "eighty-one million, one hundred fifty-nine thousand, fifty-five".