81412 has 6 divisors (see below), whose sum is σ = 142478. Its totient is φ = 40704.

The previous prime is 81409. The next prime is 81421. The reversal of 81412 is 21418.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 65536 + 15876 = 256^2 + 126^2 .

It is an alternating number because its digits alternate between even and odd.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10173 + ... + 10180.

2⁸¹⁴¹² is an apocalyptic number.

It is an amenable number.

81412 is a deficient number, since it is larger than the sum of its proper divisors (61066).

81412 is a wasteful number, since it uses less digits than its factorization.

81412 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20357 (or 20355 counting only the distinct ones).

The product of its digits is 64, while the sum is 16.

The square root of 81412 is about 285.3278815679. The cubic root of 81412 is about 43.3407219485.

The spelling of 81412 in words is "eighty-one thousand, four hundred twelve".