81470118 has 16 divisors (see below), whose sum is σ = 163031040. Its totient is φ = 27141576.

The previous prime is 81470111. The next prime is 81470131. The reversal of 81470118 is 81107418.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81470111) by changing a digit.

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 7 ways as a sum of consecutive naturals, for example, 15243 + ... + 19881.

It is an arithmetic number, because the mean of its divisors is an integer number (10189440).

Almost surely, 2^81470118 is an apocalyptic number.

81470118 is an abundant number, since it is smaller than the sum of its proper divisors (81560922).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

81470118 is a wasteful number, since it uses less digits than its factorization.

81470118 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7571.

The product of its (nonzero) digits is 1792, while the sum is 30.

The square root of 81470118 is about 9026.0798799922. The cubic root of 81470118 is about 433.5103278285.

The spelling of 81470118 in words is "eighty-one million, four hundred seventy thousand, one hundred eighteen".