81608103 has 6 divisors (see below), whose sum is σ = 117878384. Its totient is φ = 54405396.

The previous prime is 81608083. The next prime is 81608113. The reversal of 81608103 is 30180618.

It is not a de Polignac number, because 81608103 - 2⁸ = 81607847 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81608113) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 4533775 + ... + 4533792.

Almost surely, 2^81608103 is an apocalyptic number.

81608103 is a deficient number, since it is larger than the sum of its proper divisors (36270281).

81608103 is a wasteful number, since it uses less digits than its factorization.

81608103 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9067573 (or 9067570 counting only the distinct ones).

The product of its (nonzero) digits is 1152, while the sum is 27.

The square root of 81608103 is about 9033.7203299637. The cubic root of 81608103 is about 433.7549336006.

The spelling of 81608103 in words is "eighty-one million, six hundred eight thousand, one hundred three".