81375118 has 16 divisors (see below), whose sum is σ = 135149184. Its totient is φ = 36435960.

The previous prime is 81375097. The next prime is 81375167. The reversal of 81375118 is 81157318.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 26130 + ... + 29077.

It is an arithmetic number, because the mean of its divisors is an integer number (8446824).

Almost surely, 2^81375118 is an apocalyptic number.

81375118 is a deficient number, since it is larger than the sum of its proper divisors (53774066).

81375118 is a wasteful number, since it uses less digits than its factorization.

81375118 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 55287.

The product of its digits is 6720, while the sum is 34.

The square root of 81375118 is about 9020.8158167651. The cubic root of 81375118 is about 433.3417609143.

The spelling of 81375118 in words is "eighty-one million, three hundred seventy-five thousand, one hundred eighteen".