81418514 has 8 divisors (see below), whose sum is σ = 122224188. Its totient is φ = 40677120.

The previous prime is 81418507. The next prime is 81418529. The reversal of 81418514 is 41581418.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 81306289 + 112225 = 9017^2 + 335^2 .

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

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 12767 + ... + 18050.

Almost surely, 2^81418514 is an apocalyptic number.

81418514 is a deficient number, since it is larger than the sum of its proper divisors (40805674).

81418514 is a wasteful number, since it uses less digits than its factorization.

81418514 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 32140.

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

The square root of 81418514 is about 9023.2208218573. The cubic root of 81418514 is about 433.4187785485.

The spelling of 81418514 in words is "eighty-one million, four hundred eighteen thousand, five hundred fourteen".