181427439249 has 45 divisors (see below), whose sum is σ = 315316239051. Its totient is φ = 103657488480.

The previous prime is 181427439203. The next prime is 181427439299. The reversal of 181427439249 is 942934724181.

The square root of 181427439249 is 425943.

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

181427439249 is a `hidden beast` number, since 1 + 8 + 142 + 74 + 392 + 49 = 666.

181427439249 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 only one way, i.e., 144747528849 + 36679910400 = 380457^2 + 191520^2 .

It is not a de Polignac number, because 181427439249 - 2¹³ = 181427431057 is a prime.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 181427439195 and 181427439204.

It is not an unprimeable number, because it can be changed into a prime (181427439299) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 44 ways as a sum of consecutive naturals, for example, 26831029 + ... + 26837789.

Almost surely, 2^181427439249 is an apocalyptic number.

181427439249 is the 425943-rd square number.

181427439249 is the 212972-nd centered octagonal number.

It is an amenable number.

181427439249 is a deficient number, since it is larger than the sum of its proper divisors (133888799802).

181427439249 is an frugal number, since it uses more digits than its factorization.

181427439249 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13548 (or 6771 counting only the distinct ones).

The product of its digits is 3483648, while the sum is 54.

The spelling of 181427439249 in words is "one hundred eighty-one billion, four hundred twenty-seven million, four hundred thirty-nine thousand, two hundred forty-nine".