81445012 has 12 divisors (see below), whose sum is σ = 155486016. Its totient is φ = 37020440.

The previous prime is 81444997. The next prime is 81445027. The reversal of 81445012 is 21054418.

It is an interprime number because it is at equal distance from previous prime (81444997) and next prime (81445027).

It is a congruent number.

It is an unprimeable number.

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 3 ways as a sum of consecutive naturals, for example, 925468 + ... + 925555.

It is an arithmetic number, because the mean of its divisors is an integer number (12957168).

Almost surely, 2^81445012 is an apocalyptic number.

It is an amenable number.

81445012 is a deficient number, since it is larger than the sum of its proper divisors (74041004).

81445012 is a wasteful number, since it uses less digits than its factorization.

81445012 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1851038 (or 1851036 counting only the distinct ones).

The product of its (nonzero) digits is 1280, while the sum is 25.

The square root of 81445012 is about 9024.6890251133. The cubic root of 81445012 is about 433.4657927738.

The spelling of 81445012 in words is "eighty-one million, four hundred forty-five thousand, twelve".