81345112 has 32 divisors (see below), whose sum is σ = 159677280. Its totient is φ = 38776320.

The previous prime is 81345067. The next prime is 81345113. The reversal of 81345112 is 21154318.

It is a Smith number, since the sum of its digits (25) coincides with the sum of the digits of its prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81345113) 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 7 ways as a sum of consecutive naturals, for example, 79162 + ... + 80182.

It is an arithmetic number, because the mean of its divisors is an integer number (4989915).

Almost surely, 2^81345112 is an apocalyptic number.

It is an amenable number.

81345112 is a deficient number, since it is larger than the sum of its proper divisors (78332168).

81345112 is a wasteful number, since it uses less digits than its factorization.

81345112 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1483 (or 1479 counting only the distinct ones).

The product of its digits is 960, while the sum is 25.

The square root of 81345112 is about 9019.1525100754. The cubic root of 81345112 is about 433.2884913493.

The spelling of 81345112 in words is "eighty-one million, three hundred forty-five thousand, one hundred twelve".