181325636 has 6 divisors (see below), whose sum is σ = 317319870. Its totient is φ = 90662816.

The previous prime is 181325609. The next prime is 181325681. The reversal of 181325636 is 636523181.

It can be written as a sum of positive squares in only one way, i.e., 98406400 + 82919236 = 9920^2 + 9106^2 .

It is a junction number, because it is equal to n+sod(n) for n = 181325596 and 181325605.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 22665701 + ... + 22665708.

It is an arithmetic number, because the mean of its divisors is an integer number (52886645).

Almost surely, 2^181325636 is an apocalyptic number.

It is an amenable number.

181325636 is a deficient number, since it is larger than the sum of its proper divisors (135994234).

181325636 is a wasteful number, since it uses less digits than its factorization.

181325636 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 45331413 (or 45331411 counting only the distinct ones).

The product of its digits is 25920, while the sum is 35.

The square root of 181325636 is about 13465.7207753614. The cubic root of 181325636 is about 566.0043076749.

The spelling of 181325636 in words is "one hundred eighty-one million, three hundred twenty-five thousand, six hundred thirty-six".