81144118 has 8 divisors (see below), whose sum is σ = 132781320. Its totient is φ = 36883680.

The previous prime is 81144097. The next prime is 81144127.

81144118 is nontrivially palindromic in base 10.

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

It is a congruent number.

It is an unprimeable number.

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 3 ways as a sum of consecutive naturals, for example, 1844163 + ... + 1844206.

It is an arithmetic number, because the mean of its divisors is an integer number (16597665).

Almost surely, 2^81144118 is an apocalyptic number.

81144118 is a deficient number, since it is larger than the sum of its proper divisors (51637202).

81144118 is a wasteful number, since it uses less digits than its factorization.

81144118 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3688382.

The product of its digits is 1024, while the sum is 28.

The square root of 81144118 is about 9008.0029973352. The cubic root of 81144118 is about 432.9313290818.

The spelling of 81144118 in words is "eighty-one million, one hundred forty-four thousand, one hundred eighteen".