81814265 has 8 divisors (see below), whose sum is σ = 105729288. Its totient is φ = 60416640.

The previous prime is 81814253. The next prime is 81814267. The reversal of 81814265 is 56241818.

It can be written as a sum of positive squares in 4 ways, for example, as 13388281 + 68425984 = 3659^2 + 8272^2 .

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

It is not a de Polignac number, because 81814265 - 2⁸ = 81814009 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (81814267) 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 in 7 ways as a sum of consecutive naturals, for example, 629276 + ... + 629405.

It is an arithmetic number, because the mean of its divisors is an integer number (13216161).

Almost surely, 2^81814265 is an apocalyptic number.

It is an amenable number.

81814265 is a deficient number, since it is larger than the sum of its proper divisors (23915023).

81814265 is a wasteful number, since it uses less digits than its factorization.

81814265 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1258699.

The product of its digits is 15360, while the sum is 35.

The square root of 81814265 is about 9045.1238244703. The cubic root of 81814265 is about 434.1198834227.

The spelling of 81814265 in words is "eighty-one million, eight hundred fourteen thousand, two hundred sixty-five".