81158163 has 8 divisors (see below), whose sum is σ = 108262800. Its totient is φ = 54079488.

The previous prime is 81158149. The next prime is 81158171. The reversal of 81158163 is 36185118.

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

It is not a de Polignac number, because 81158163 - 2²¹ = 79061011 is a prime.

It is not an unprimeable number, because it can be changed into a prime (81158113) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2643 + ... + 13011.

It is an arithmetic number, because the mean of its divisors is an integer number (13532850).

Almost surely, 2^81158163 is an apocalyptic number.

81158163 is a deficient number, since it is larger than the sum of its proper divisors (27104637).

81158163 is a wasteful number, since it uses less digits than its factorization.

81158163 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12981.

The product of its digits is 5760, while the sum is 33.

The square root of 81158163 is about 9008.7825481582. The cubic root of 81158163 is about 432.9563059167.

The spelling of 81158163 in words is "eighty-one million, one hundred fifty-eight thousand, one hundred sixty-three".