81348009 has 12 divisors (see below), whose sum is σ = 115220784. Its totient is φ = 51041344.

The previous prime is 81347971. The next prime is 81348011. The reversal of 81348009 is 90084318.

It is not a de Polignac number, because 81348009 - 2⁷ = 81347881 is a prime.

It is not an unprimeable number, because it can be changed into a prime (81348049) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 46047 + ... + 47780.

It is an arithmetic number, because the mean of its divisors is an integer number (9601732).

Almost surely, 2^81348009 is an apocalyptic number.

It is an amenable number.

81348009 is a deficient number, since it is larger than the sum of its proper divisors (33872775).

81348009 is a wasteful number, since it uses less digits than its factorization.

81348009 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 93864 (or 93847 counting only the distinct ones).

The product of its (nonzero) digits is 6912, while the sum is 33.

The square root of 81348009 is about 9019.3131113184. The cubic root of 81348009 is about 433.2936349563.

The spelling of 81348009 in words is "eighty-one million, three hundred forty-eight thousand, nine".