81041616 has 30 divisors (see below), whose sum is σ = 226804370. Its totient is φ = 27013824.

The previous prime is 81041603. The next prime is 81041617. The reversal of 81041616 is 61614018.

81041616 is a `hidden beast` number, since 8 + 1 + 0 + 41 + 616 = 666.

It can be written as a sum of positive squares in only one way, i.e., 81000000 + 41616 = 9000^2 + 204^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 81041616.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81041617) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 281251 + ... + 281538.

Almost surely, 2^81041616 is an apocalyptic number.

It is an amenable number.

81041616 is an abundant number, since it is smaller than the sum of its proper divisors (145762754).

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

81041616 is a wasteful number, since it uses less digits than its factorization.

81041616 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 562803 (or 562794 counting only the distinct ones).

The product of its (nonzero) digits is 1152, while the sum is 27.

The square root of 81041616 is about 9002.3117031127. The cubic root of 81041616 is about 432.7489579835.

The spelling of 81041616 in words is "eighty-one million, forty-one thousand, six hundred sixteen".