81012442 has 8 divisors (see below), whose sum is σ = 138878496. Its totient is φ = 34719612.

The previous prime is 81012439. The next prime is 81012479. The reversal of 81012442 is 24421018.

It is a sphenic number, since it is the product of 3 distinct primes.

It is an unprimeable number.

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 3 ways as a sum of consecutive naturals, for example, 2893288 + ... + 2893315.

It is an arithmetic number, because the mean of its divisors is an integer number (17359812).

Almost surely, 2^81012442 is an apocalyptic number.

81012442 is a deficient number, since it is larger than the sum of its proper divisors (57866054).

81012442 is a wasteful number, since it uses less digits than its factorization.

81012442 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5786612.

The product of its (nonzero) digits is 512, while the sum is 22.

The square root of 81012442 is about 9000.6911956805. The cubic root of 81012442 is about 432.6970236236.

The spelling of 81012442 in words is "eighty-one million, twelve thousand, four hundred forty-two".