81708203 has 4 divisors (see below), whose sum is σ = 83701128. Its totient is φ = 79715280.

The previous prime is 81708181. The next prime is 81708217. The reversal of 81708203 is 30280718.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 81708203 - 2²² = 77513899 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (81708223) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 996401 + ... + 996482.

It is an arithmetic number, because the mean of its divisors is an integer number (20925282).

Almost surely, 2^81708203 is an apocalyptic number.

81708203 is a deficient number, since it is larger than the sum of its proper divisors (1992925).

81708203 is a wasteful number, since it uses less digits than its factorization.

81708203 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1992924.

The product of its (nonzero) digits is 2688, while the sum is 29.

The square root of 81708203 is about 9039.2589851160. The cubic root of 81708203 is about 433.9322081885.

The spelling of 81708203 in words is "eighty-one million, seven hundred eight thousand, two hundred three".