81463273 has 8 divisors (see below), whose sum is σ = 82428192. Its totient is φ = 80502336.

The previous prime is 81463271. The next prime is 81463297. The reversal of 81463273 is 37236418.

It is a happy number.

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

It is a cyclic number.

It is not a de Polignac number, because 81463273 - 2¹ = 81463271 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (81463271) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 62161 + ... + 63457.

It is an arithmetic number, because the mean of its divisors is an integer number (10303524).

Almost surely, 2^81463273 is an apocalyptic number.

It is an amenable number.

81463273 is a deficient number, since it is larger than the sum of its proper divisors (964919).

81463273 is a wasteful number, since it uses less digits than its factorization.

81463273 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1991.

The product of its digits is 24192, while the sum is 34.

The square root of 81463273 is about 9025.7006930210. The cubic root of 81463273 is about 433.4981865208.

The spelling of 81463273 in words is "eighty-one million, four hundred sixty-three thousand, two hundred seventy-three".