181045538 has 16 divisors (see below), whose sum is σ = 274269240. Its totient is φ = 89627136.

The previous prime is 181045531. The next prime is 181045541. The reversal of 181045538 is 835540181.

It can be written as a sum of positive squares in 4 ways, for example, as 160858489 + 20187049 = 12683^2 + 4493^2 .

It is a junction number, because it is equal to n+sod(n) for n = 181045498 and 181045507.

It is not an unprimeable number, because it can be changed into a prime (181045531) 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 7 ways as a sum of consecutive naturals, for example, 94898 + ... + 96786.

Almost surely, 2^181045538 is an apocalyptic number.

181045538 is a deficient number, since it is larger than the sum of its proper divisors (93223702).

181045538 is a wasteful number, since it uses less digits than its factorization.

181045538 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2341.

The product of its (nonzero) digits is 19200, while the sum is 35.

The square root of 181045538 is about 13455.3163470801. The cubic root of 181045538 is about 565.7127173994.

The spelling of 181045538 in words is "one hundred eighty-one million, forty-five thousand, five hundred thirty-eight".