81130186 has 8 divisors (see below), whose sum is σ = 122501664. Its totient is φ = 40296300.

The previous prime is 81130163. The next prime is 81130187. The reversal of 81130186 is 68103118.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not an unprimeable number, because it can be changed into a prime (81130187) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 134020 + ... + 134623.

It is an arithmetic number, because the mean of its divisors is an integer number (15312708).

Almost surely, 2^81130186 is an apocalyptic number.

81130186 is a deficient number, since it is larger than the sum of its proper divisors (41371478).

81130186 is a wasteful number, since it uses less digits than its factorization.

81130186 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 268796.

The product of its (nonzero) digits is 1152, while the sum is 28.

The square root of 81130186 is about 9007.2296517853. The cubic root of 81130186 is about 432.9065503520.

The spelling of 81130186 in words is "eighty-one million, one hundred thirty thousand, one hundred eighty-six".