81243042 has 16 divisors (see below), whose sum is σ = 162615360. Its totient is φ = 27059472.

The previous prime is 81243023. The next prime is 81243077. The reversal of 81243042 is 24034218.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4059 + ... + 13377.

It is an arithmetic number, because the mean of its divisors is an integer number (10163460).

Almost surely, 2^81243042 is an apocalyptic number.

81243042 is an abundant number, since it is smaller than the sum of its proper divisors (81372318).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

81243042 is a wasteful number, since it uses less digits than its factorization.

81243042 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10777.

The product of its (nonzero) digits is 1536, while the sum is 24.

The square root of 81243042 is about 9013.4922200000. The cubic root of 81243042 is about 433.1071886422.

The spelling of 81243042 in words is "eighty-one million, two hundred forty-three thousand, forty-two".