81471232903 has 2 divisors, whose sum is σ = 81471232904. Its totient is φ = 81471232902.

The previous prime is 81471232901. The next prime is 81471232961. The reversal of 81471232903 is 30923217418.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 81471232903 - 2¹ = 81471232901 is a prime.

Together with 81471232901, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (81471232901) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 40735616451 + 40735616452.

It is an arithmetic number, because the mean of its divisors is an integer number (40735616452).

Almost surely, 2^81471232903 is an apocalyptic number.

81471232903 is a deficient number, since it is larger than the sum of its proper divisors (1).

81471232903 is an equidigital number, since it uses as much as digits as its factorization.

81471232903 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 72576, while the sum is 40.

The spelling of 81471232903 in words is "eighty-one billion, four hundred seventy-one million, two hundred thirty-two thousand, nine hundred three".