81608003 has 2 divisors, whose sum is σ = 81608004. Its totient is φ = 81608002.

The previous prime is 81607993. The next prime is 81608053. The reversal of 81608003 is 30080618.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 81608003 - 2¹⁰ = 81606979 is a prime.

It is not a weakly prime, because it can be changed into another prime (81608053) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 40804001 + 40804002.

It is an arithmetic number, because the mean of its divisors is an integer number (40804002).

Almost surely, 2^81608003 is an apocalyptic number.

81608003 is a deficient number, since it is larger than the sum of its proper divisors (1).

81608003 is an equidigital number, since it uses as much as digits as its factorization.

81608003 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1152, while the sum is 26.

The square root of 81608003 is about 9033.7147951438. The cubic root of 81608003 is about 433.7547564306.

The spelling of 81608003 in words is "eighty-one million, six hundred eight thousand, three".