181801012 has 12 divisors (see below), whose sum is σ = 321727140. Its totient is φ = 89878976.

The previous prime is 181801003. The next prime is 181801013. The reversal of 181801012 is 210108181.

It can be written as a sum of positive squares in 2 ways, for example, as 27941796 + 153859216 = 5286^2 + 12404^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (181801013) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 254983 + ... + 255694.

It is an arithmetic number, because the mean of its divisors is an integer number (26810595).

Almost surely, 2^181801012 is an apocalyptic number.

It is an amenable number.

181801012 is a deficient number, since it is larger than the sum of its proper divisors (139926128).

181801012 is a wasteful number, since it uses less digits than its factorization.

181801012 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 510770 (or 510768 counting only the distinct ones).

The product of its (nonzero) digits is 128, while the sum is 22.

The square root of 181801012 is about 13483.3605603351. The cubic root of 181801012 is about 566.4985015801.

Adding to 181801012 its reverse (210108181), we get a palindrome (391909193).

The spelling of 181801012 in words is "one hundred eighty-one million, eight hundred one thousand, twelve".