180000081 has 12 divisors (see below), whose sum is σ = 264263220. Its totient is φ = 118032480.

The previous prime is 180000061. The next prime is 180000089.

It is a happy number.

180000081 is nontrivially palindromic in base 10.

180000081 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 2 ways, for example, as 5363856 + 174636225 = 2316^2 + 13215^2 .

It is not a de Polignac number, because 180000081 - 2⁵ = 180000049 is a prime.

It is a super-2 number, since 2×180000081² = 64800058320013122, which contains 22 as substring.

180000081 is a strobogrammatic number because it is the same when read upside-down.

180000081 is a modest number, since divided by 81 gives 18 as remainder.

It is not an unprimeable number, because it can be changed into a prime (180000089) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 163386 + ... + 164483.

It is an arithmetic number, because the mean of its divisors is an integer number (22021935).

Almost surely, 2^180000081 is an apocalyptic number.

It is an amenable number.

180000081 is a deficient number, since it is larger than the sum of its proper divisors (84263139).

180000081 is a wasteful number, since it uses less digits than its factorization.

180000081 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 327936 (or 327933 counting only the distinct ones).

The product of its (nonzero) digits is 64, while the sum is 18.

The square root of 180000081 is about 13416.4108836902. The cubic root of 180000081 is about 564.6217020218.

It can be divided in two parts, 1800000 and 81, that added together give a palindrome (1800081).

The spelling of 180000081 in words is "one hundred eighty million, eighty-one", and thus it is an aban number.