81485163 has 16 divisors (see below), whose sum is σ = 123664800. Its totient is φ = 52997760.

The previous prime is 81485153. The next prime is 81485171. The reversal of 81485163 is 36158418.

It is not a de Polignac number, because 81485163 - 2⁴ = 81485147 is a prime.

It is not an unprimeable number, because it can be changed into a prime (81485123) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 35698 + ... + 37911.

It is an arithmetic number, because the mean of its divisors is an integer number (7729050).

Almost surely, 2^81485163 is an apocalyptic number.

81485163 is a deficient number, since it is larger than the sum of its proper divisors (42179637).

81485163 is a wasteful number, since it uses less digits than its factorization.

81485163 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 73659 (or 73653 counting only the distinct ones).

The product of its digits is 23040, while the sum is 36.

The square root of 81485163 is about 9026.9132598026. The cubic root of 81485163 is about 433.5370114830.

The spelling of 81485163 in words is "eighty-one million, four hundred eighty-five thousand, one hundred sixty-three".