81155163 has 4 divisors (see below), whose sum is σ = 108206888. Its totient is φ = 54103440.

The previous prime is 81155119. The next prime is 81155177. The reversal of 81155163 is 36155118.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 81155163 - 2¹³ = 81146971 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 81155163.

It is not an unprimeable number, because it can be changed into a prime (81155563) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 13525858 + ... + 13525863.

It is an arithmetic number, because the mean of its divisors is an integer number (27051722).

Almost surely, 2^81155163 is an apocalyptic number.

81155163 is a deficient number, since it is larger than the sum of its proper divisors (27051725).

81155163 is a wasteful number, since it uses less digits than its factorization.

81155163 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 27051724.

The product of its digits is 3600, while the sum is 30.

The square root of 81155163 is about 9008.6160424340. The cubic root of 81155163 is about 432.9509711282.

It can be divided in two parts, 81155 and 163, that added together give a palindrome (81318).

The spelling of 81155163 in words is "eighty-one million, one hundred fifty-five thousand, one hundred sixty-three".