181048181 has 4 divisors (see below), whose sum is σ = 191698092. Its totient is φ = 170398272.

The previous prime is 181048151. The next prime is 181048193. The reversal of 181048181 is 181840181.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 63520900 + 117527281 = 7970^2 + 10841^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-181048181 is a prime.

It is a super-2 number, since 2×181048181² = 65556887686817522, which contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (181048121) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5324930 + ... + 5324963.

It is an arithmetic number, because the mean of its divisors is an integer number (47924523).

Almost surely, 2^181048181 is an apocalyptic number.

It is an amenable number.

181048181 is a deficient number, since it is larger than the sum of its proper divisors (10649911).

181048181 is a wasteful number, since it uses less digits than its factorization.

181048181 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10649910.

The product of its (nonzero) digits is 2048, while the sum is 32.

The square root of 181048181 is about 13455.4145606889. The cubic root of 181048181 is about 565.7154702453.

The spelling of 181048181 in words is "one hundred eighty-one million, forty-eight thousand, one hundred eighty-one".