81816103 has 2 divisors, whose sum is σ = 81816104. Its totient is φ = 81816102.

The previous prime is 81816089. The next prime is 81816107. The reversal of 81816103 is 30161818.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 81816103 - 2¹³ = 81807911 is a prime.

It is an alternating number because its digits alternate between even and odd.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (81816107) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 40908051 + 40908052.

It is an arithmetic number, because the mean of its divisors is an integer number (40908052).

Almost surely, 2^81816103 is an apocalyptic number.

81816103 is a deficient number, since it is larger than the sum of its proper divisors (1).

81816103 is an equidigital number, since it uses as much as digits as its factorization.

81816103 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1152, while the sum is 28.

The square root of 81816103 is about 9045.2254256044. The cubic root of 81816103 is about 434.1231343080.

The spelling of 81816103 in words is "eighty-one million, eight hundred sixteen thousand, one hundred three".