81016942 has 4 divisors (see below), whose sum is σ = 121525416. Its totient is φ = 40508470.

The previous prime is 81016921. The next prime is 81016963. The reversal of 81016942 is 24961018.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 24961018 = 2 ⋅12480509.

It is an interprime number because it is at equal distance from previous prime (81016921) and next prime (81016963).

It is a Smith number, since the sum of its digits (31) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a congruent number.

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 as a sum of consecutive naturals, namely, 20254234 + ... + 20254237.

It is an arithmetic number, because the mean of its divisors is an integer number (30381354).

Almost surely, 2^81016942 is an apocalyptic number.

81016942 is a deficient number, since it is larger than the sum of its proper divisors (40508474).

81016942 is a wasteful number, since it uses less digits than its factorization.

81016942 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 40508473.

The product of its (nonzero) digits is 3456, while the sum is 31.

The square root of 81016942 is about 9000.9411730107. The cubic root of 81016942 is about 432.7050351525.

The spelling of 81016942 in words is "eighty-one million, sixteen thousand, nine hundred forty-two".