81018162 has 12 divisors (see below), whose sum is σ = 175539390. Its totient is φ = 27006048.

The previous prime is 81018131. The next prime is 81018163. The reversal of 81018162 is 26181018.

It can be written as a sum of positive squares in only one way, i.e., 51108201 + 29909961 = 7149^2 + 5469^2 .

It is a Smith number, since the sum of its digits (27) coincides with the sum of the digits of its prime factors.

It is not an unprimeable number, because it can be changed into a prime (81018163) 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 5 ways as a sum of consecutive naturals, for example, 2250487 + ... + 2250522.

Almost surely, 2^81018162 is an apocalyptic number.

81018162 is an abundant number, since it is smaller than the sum of its proper divisors (94521228).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

81018162 is a wasteful number, since it uses less digits than its factorization.

81018162 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4501017 (or 4501014 counting only the distinct ones).

The product of its (nonzero) digits is 768, while the sum is 27.

The square root of 81018162 is about 9001.0089434463. The cubic root of 81018162 is about 432.7072071159.

The spelling of 81018162 in words is "eighty-one million, eighteen thousand, one hundred sixty-two".