181530868 has 6 divisors (see below), whose sum is σ = 317679026. Its totient is φ = 90765432.

The previous prime is 181530859. The next prime is 181530887. The reversal of 181530868 is 868035181.

It can be written as a sum of positive squares in only one way, i.e., 180956304 + 574564 = 13452^2 + 758^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 181530868.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 22691355 + ... + 22691362.

Almost surely, 2^181530868 is an apocalyptic number.

It is an amenable number.

181530868 is a deficient number, since it is larger than the sum of its proper divisors (136148158).

181530868 is a wasteful number, since it uses less digits than its factorization.

181530868 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 45382721 (or 45382719 counting only the distinct ones).

The product of its (nonzero) digits is 46080, while the sum is 40.

The square root of 181530868 is about 13473.3391555323. The cubic root of 181530868 is about 566.2177696733.

The spelling of 181530868 in words is "one hundred eighty-one million, five hundred thirty thousand, eight hundred sixty-eight".