181239221284 has 81 divisors (see below), whose sum is σ = 358986683601. Its totient is φ = 80001678240.

The previous prime is 181239221281. The next prime is 181239221327. The reversal of 181239221284 is 482122932181.

The square root of 181239221284 is 425722.

It is a perfect power (a square), and thus also a powerful number.

It can be written as a sum of positive squares in only one way, i.e., 162175344100 + 19063877184 = 402710^2 + 138072^2 .

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 181239221284.

It is not an unprimeable number, because it can be changed into a prime (181239221281) by changing a digit.

It is a polite number, since it can be written in 26 ways as a sum of consecutive naturals, for example, 346537447 + ... + 346537969.

Almost surely, 2^181239221284 is an apocalyptic number.

181239221284 is the 425722-nd square number.

It is an amenable number.

181239221284 is a deficient number, since it is larger than the sum of its proper divisors (177747462317).

181239221284 is an equidigital number, since it uses as much as digits as its factorization.

181239221284 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1146 (or 573 counting only the distinct ones).

The product of its digits is 110592, while the sum is 43.

The spelling of 181239221284 in words is "one hundred eighty-one billion, two hundred thirty-nine million, two hundred twenty-one thousand, two hundred eighty-four".