81968903 has 2 divisors, whose sum is σ = 81968904. Its totient is φ = 81968902.

The previous prime is 81968897. The next prime is 81968989. The reversal of 81968903 is 30986918.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 81968903 - 2⁶ = 81968839 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (81968303) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 40984451 + 40984452.

It is an arithmetic number, because the mean of its divisors is an integer number (40984452).

Almost surely, 2^81968903 is an apocalyptic number.

81968903 is a deficient number, since it is larger than the sum of its proper divisors (1).

81968903 is an equidigital number, since it uses as much as digits as its factorization.

81968903 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 93312, while the sum is 44.

The square root of 81968903 is about 9053.6679307339. The cubic root of 81968903 is about 434.3932227954.

The spelling of 81968903 in words is "eighty-one million, nine hundred sixty-eight thousand, nine hundred three".