181141805 has 18 divisors (see below), whose sum is σ = 235886634. Its totient is φ = 133477344.

The previous prime is 181141799. The next prime is 181141823. The reversal of 181141805 is 508141181.

It can be written as a sum of positive squares in 3 ways, for example, as 857476 + 180284329 = 926^2 + 13427^2 .

It is not a de Polignac number, because 181141805 - 2¹² = 181137709 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

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 17 ways as a sum of consecutive naturals, for example, 391004 + ... + 391466.

It is an arithmetic number, because the mean of its divisors is an integer number (13104813).

Almost surely, 2^181141805 is an apocalyptic number.

It is an amenable number.

181141805 is a deficient number, since it is larger than the sum of its proper divisors (54744829).

181141805 is an frugal number, since it uses more digits than its factorization.

181141805 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 957 (or 481 counting only the distinct ones).

The product of its (nonzero) digits is 1280, while the sum is 29.

The square root of 181141805 is about 13458.8931565712. The cubic root of 181141805 is about 565.8129680823.

Multiplying 181141805 by its product of nonzero digits (1280), we get a square (231861510400 = 481520²).

Adding to 181141805 its reverse (508141181), we get a palindrome (689282986).

The spelling of 181141805 in words is "one hundred eighty-one million, one hundred forty-one thousand, eight hundred five".