81516273 has 8 divisors (see below), whose sum is σ = 108815808. Its totient is φ = 54280464.

The previous prime is 81516221. The next prime is 81516277. The reversal of 81516273 is 37261518.

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

It is not a de Polignac number, because 81516273 - 2¹² = 81512177 is a prime.

It is not an unprimeable number, because it can be changed into a prime (81516277) by changing a digit.

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 7 ways as a sum of consecutive naturals, for example, 12861 + ... + 18122.

It is an arithmetic number, because the mean of its divisors is an integer number (13601976).

Almost surely, 2^81516273 is an apocalyptic number.

It is an amenable number.

81516273 is a deficient number, since it is larger than the sum of its proper divisors (27299535).

81516273 is a wasteful number, since it uses less digits than its factorization.

81516273 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 31863.

The product of its digits is 10080, while the sum is 33.

The square root of 81516273 is about 9028.6362757617. The cubic root of 81516273 is about 433.5921774374.

The spelling of 81516273 in words is "eighty-one million, five hundred sixteen thousand, two hundred seventy-three".