81061316 has 12 divisors (see below), whose sum is σ = 162122688. Its totient is φ = 34740552.

The previous prime is 81061313. The next prime is 81061397. The reversal of 81061316 is 61316018.

81061316 is an admirable number.

It is not an unprimeable number, because it can be changed into a prime (81061313) 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 3 ways as a sum of consecutive naturals, for example, 1447496 + ... + 1447551.

It is an arithmetic number, because the mean of its divisors is an integer number (13510224).

Almost surely, 2^81061316 is an apocalyptic number.

It is an amenable number.

81061316 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.

81061316 is a wasteful number, since it uses less digits than its factorization.

81061316 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2895058 (or 2895056 counting only the distinct ones).

The product of its (nonzero) digits is 864, while the sum is 26.

The square root of 81061316 is about 9003.4058000292. The cubic root of 81061316 is about 432.7840200673.

It can be divided in two parts, 810 and 61316, that added together give a palindrome (62126).

The spelling of 81061316 in words is "eighty-one million, sixty-one thousand, three hundred sixteen".