81300099 has 4 divisors (see below), whose sum is σ = 108400136. Its totient is φ = 54200064.

The previous prime is 81300071. The next prime is 81300113. The reversal of 81300099 is 99000318.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 81300099 - 2⁹ = 81299587 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (81300019) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 13550014 + ... + 13550019.

It is an arithmetic number, because the mean of its divisors is an integer number (27100034).

Almost surely, 2^81300099 is an apocalyptic number.

81300099 is a deficient number, since it is larger than the sum of its proper divisors (27100037).

81300099 is a wasteful number, since it uses less digits than its factorization.

81300099 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 27100036.

The product of its (nonzero) digits is 1944, while the sum is 30.

The square root of 81300099 is about 9016.6567529212. The cubic root of 81300099 is about 433.2085553295.

The spelling of 81300099 in words is "eighty-one million, three hundred thousand, ninety-nine".