81516342 has 8 divisors (see below), whose sum is σ = 163032696. Its totient is φ = 27172112.

The previous prime is 81516341. The next prime is 81516359. The reversal of 81516342 is 24361518.

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

81516342 is an admirable number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81516341) 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 3 ways as a sum of consecutive naturals, for example, 6793023 + ... + 6793034.

It is an arithmetic number, because the mean of its divisors is an integer number (20379087).

Almost surely, 2^81516342 is an apocalyptic number.

81516342 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

81516342 is a wasteful number, since it uses less digits than its factorization.

81516342 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13586062.

The product of its digits is 5760, while the sum is 30.

The square root of 81516342 is about 9028.6400969360. The cubic root of 81516342 is about 433.5922997763.

The spelling of 81516342 in words is "eighty-one million, five hundred sixteen thousand, three hundred forty-two".