81299003 has 6 divisors (see below), whose sum is σ = 81663564. Its totient is φ = 80935976.

The previous prime is 81298999. The next prime is 81299011. The reversal of 81299003 is 30099218.

It is not a de Polignac number, because 81299003 - 2² = 81298999 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (81299903) 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 5 ways as a sum of consecutive naturals, for example, 85376 + ... + 86322.

It is an arithmetic number, because the mean of its divisors is an integer number (13610594).

Almost surely, 2^81299003 is an apocalyptic number.

81299003 is a deficient number, since it is larger than the sum of its proper divisors (364561).

81299003 is an frugal number, since it uses more digits than its factorization.

81299003 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1533 (or 1240 counting only the distinct ones).

The product of its (nonzero) digits is 3888, while the sum is 32.

The square root of 81299003 is about 9016.5959763095. The cubic root of 81299003 is about 433.2066086377.

The spelling of 81299003 in words is "eighty-one million, two hundred ninety-nine thousand, three".