81041612 has 18 divisors (see below), whose sum is σ = 149682708. Its totient is φ = 38387448.

The previous prime is 81041603. The next prime is 81041617. The reversal of 81041612 is 21614018.

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

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 26618 + ... + 29505.

It is an arithmetic number, because the mean of its divisors is an integer number (8315706).

Almost surely, 2^81041612 is an apocalyptic number.

It is an amenable number.

81041612 is a deficient number, since it is larger than the sum of its proper divisors (68641096).

81041612 is a wasteful number, since it uses less digits than its factorization.

81041612 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 56165 (or 56144 counting only the distinct ones).

The product of its (nonzero) digits is 384, while the sum is 23.

The square root of 81041612 is about 9002.3114809475. The cubic root of 81041612 is about 432.7489508637.

The spelling of 81041612 in words is "eighty-one million, forty-one thousand, six hundred twelve".