181742164 has 12 divisors (see below), whose sum is σ = 318179988. Its totient is φ = 90833600.

The previous prime is 181742149. The next prime is 181742191. The reversal of 181742164 is 461247181.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 141419664 + 40322500 = 11892^2 + 6350^2 .

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3504 + ... + 19384.

It is an arithmetic number, because the mean of its divisors is an integer number (26514999).

Almost surely, 2^181742164 is an apocalyptic number.

It is an amenable number.

181742164 is a deficient number, since it is larger than the sum of its proper divisors (136437824).

181742164 is a wasteful number, since it uses less digits than its factorization.

181742164 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18746 (or 18744 counting only the distinct ones).

The product of its digits is 10752, while the sum is 34.

The square root of 181742164 is about 13481.1781384269. The cubic root of 181742164 is about 566.4373708212.

The spelling of 181742164 in words is "one hundred eighty-one million, seven hundred forty-two thousand, one hundred sixty-four".