81011163 has 8 divisors (see below), whose sum is σ = 108678208. Its totient is φ = 53675784.

The previous prime is 81011149. The next prime is 81011197. The reversal of 81011163 is 36111018.

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

It is not a de Polignac number, because 81011163 - 2⁸ = 81010907 is a prime.

It is a super-2 number, since 2×81011163² = 13125617061225138, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (81011113) 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, 82345 + ... + 83322.

It is an arithmetic number, because the mean of its divisors is an integer number (13584776).

Almost surely, 2^81011163 is an apocalyptic number.

81011163 is a deficient number, since it is larger than the sum of its proper divisors (27667045).

81011163 is a wasteful number, since it uses less digits than its factorization.

81011163 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 165833.

The product of its (nonzero) digits is 144, while the sum is 21.

The square root of 81011163 is about 9000.6201453011. The cubic root of 81011163 is about 432.6947465150.

The spelling of 81011163 in words is "eighty-one million, eleven thousand, one hundred sixty-three".