181864136 has 16 divisors (see below), whose sum is σ = 344512140. Its totient is φ = 89994240.

The previous prime is 181864129. The next prime is 181864159. The reversal of 181864136 is 631468181.

It can be written as a sum of positive squares in 2 ways, for example, as 179399236 + 2464900 = 13394^2 + 1570^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 181864136.

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, 116405 + ... + 117956.

Almost surely, 2^181864136 is an apocalyptic number.

It is an amenable number.

181864136 is a deficient number, since it is larger than the sum of its proper divisors (162648004).

181864136 is a wasteful number, since it uses less digits than its factorization.

181864136 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 234464 (or 234460 counting only the distinct ones).

The product of its digits is 27648, while the sum is 38.

The square root of 181864136 is about 13485.7011682745. The cubic root of 181864136 is about 566.5640595457.

It can be divided in two parts, 18186 and 4136, that added together give a palindrome (22322).

The spelling of 181864136 in words is "one hundred eighty-one million, eight hundred sixty-four thousand, one hundred thirty-six".