81807103 has 16 divisors (see below), whose sum is σ = 98955520. Its totient is φ = 66064896.

The previous prime is 81807091. The next prime is 81807127. The reversal of 81807103 is 30170818.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 81807103 - 2¹⁷ = 81676031 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 (81807133) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 24076 + ... + 27262.

It is an arithmetic number, because the mean of its divisors is an integer number (6184720).

Almost surely, 2^81807103 is an apocalyptic number.

81807103 is a deficient number, since it is larger than the sum of its proper divisors (17148417).

81807103 is a wasteful number, since it uses less digits than its factorization.

81807103 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3406.

The product of its (nonzero) digits is 1344, while the sum is 28.

The square root of 81807103 is about 9044.7279118833. The cubic root of 81807103 is about 434.1072154715.

The spelling of 81807103 in words is "eighty-one million, eight hundred seven thousand, one hundred three".