81083018 has 4 divisors (see below), whose sum is σ = 121624530. Its totient is φ = 40541508.

The previous prime is 81083017. The next prime is 81083053. The reversal of 81083018 is 81038018.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 81038018 = 2 ⋅40519009.

It can be written as a sum of positive squares in only one way, i.e., 73393489 + 7689529 = 8567^2 + 2773^2 .

It is not an unprimeable number, because it can be changed into a prime (81083017) 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 as a sum of consecutive naturals, namely, 20270753 + ... + 20270756.

Almost surely, 2^81083018 is an apocalyptic number.

81083018 is a deficient number, since it is larger than the sum of its proper divisors (40541512).

81083018 is a wasteful number, since it uses less digits than its factorization.

81083018 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 40541511.

The product of its (nonzero) digits is 1536, while the sum is 29.

The square root of 81083018 is about 9004.6109299625. The cubic root of 81083018 is about 432.8226387378.

The spelling of 81083018 in words is "eighty-one million, eighty-three thousand, eighteen".