81243103 has 2 divisors, whose sum is σ = 81243104. Its totient is φ = 81243102.

The previous prime is 81243091. The next prime is 81243121. The reversal of 81243103 is 30134218.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 81243103 - 2⁹ = 81242591 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (81243163) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 40621551 + 40621552.

It is an arithmetic number, because the mean of its divisors is an integer number (40621552).

Almost surely, 2^81243103 is an apocalyptic number.

81243103 is a deficient number, since it is larger than the sum of its proper divisors (1).

81243103 is an equidigital number, since it uses as much as digits as its factorization.

81243103 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 576, while the sum is 22.

The square root of 81243103 is about 9013.4956038154. The cubic root of 81243103 is about 433.1072970393.

The spelling of 81243103 in words is "eighty-one million, two hundred forty-three thousand, one hundred three".