81099803 has 2 divisors, whose sum is σ = 81099804. Its totient is φ = 81099802.

The previous prime is 81099791. The next prime is 81099827. The reversal of 81099803 is 30899018.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 81099803 - 2²⁰ = 80051227 is a prime.

It is a Sophie Germain prime.

It is not a weakly prime, because it can be changed into another prime (81099833) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 40549901 + 40549902.

It is an arithmetic number, because the mean of its divisors is an integer number (40549902).

Almost surely, 2^81099803 is an apocalyptic number.

81099803 is a deficient number, since it is larger than the sum of its proper divisors (1).

81099803 is an equidigital number, since it uses as much as digits as its factorization.

81099803 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 15552, while the sum is 38.

The square root of 81099803 is about 9005.5429042340. The cubic root of 81099803 is about 432.8525028899.

The spelling of 81099803 in words is "eighty-one million, ninety-nine thousand, eight hundred three".