81514418 has 8 divisors (see below), whose sum is σ = 126487980. Its totient is φ = 39351760.

The previous prime is 81514409. The next prime is 81514493. The reversal of 81514418 is 81441518.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 75047569 + 6466849 = 8663^2 + 2543^2 .

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

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 702653 + ... + 702768.

Almost surely, 2^81514418 is an apocalyptic number.

81514418 is a deficient number, since it is larger than the sum of its proper divisors (44973562).

81514418 is a wasteful number, since it uses less digits than its factorization.

81514418 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1405452.

The product of its digits is 5120, while the sum is 32.

The square root of 81514418 is about 9028.5335464847. The cubic root of 81514418 is about 433.5888884434.

Subtracting from 81514418 its reverse (81441518), we obtain a square (72900 = 270²).

The spelling of 81514418 in words is "eighty-one million, five hundred fourteen thousand, four hundred eighteen".