81039002 has 16 divisors (see below), whose sum is σ = 132747552. Its totient is φ = 36797520.

The previous prime is 81038999. The next prime is 81039011. The reversal of 81039002 is 20093018.

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 7 ways as a sum of consecutive naturals, for example, 40088 + ... + 42060.

It is an arithmetic number, because the mean of its divisors is an integer number (8296722).

Almost surely, 2^81039002 is an apocalyptic number.

81039002 is a deficient number, since it is larger than the sum of its proper divisors (51708550).

81039002 is a wasteful number, since it uses less digits than its factorization.

81039002 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3853.

The product of its (nonzero) digits is 432, while the sum is 23.

The square root of 81039002 is about 9002.1665170113. The cubic root of 81039002 is about 432.7443051562.

The spelling of 81039002 in words is "eighty-one million, thirty-nine thousand, two".