81003003 has 16 divisors (see below), whose sum is σ = 114458400. Its totient is φ = 50865920.

The previous prime is 81003001. The next prime is 81003007. The reversal of 81003003 is 30030018.

It is a cyclic number.

It is not a de Polignac number, because 81003003 - 2¹ = 81003001 is a prime.

It is a super-2 number, since 2×81003003² = 13122972990036018, which contains 22 as substring.

81003003 is a modest number, since divided by 3003 gives 81 as remainder.

It is not an unprimeable number, because it can be changed into a prime (81003001) 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 15 ways as a sum of consecutive naturals, for example, 7788 + ... + 14921.

It is an arithmetic number, because the mean of its divisors is an integer number (7153650).

Almost surely, 2^81003003 is an apocalyptic number.

81003003 is a deficient number, since it is larger than the sum of its proper divisors (33455397).

81003003 is a wasteful number, since it uses less digits than its factorization.

81003003 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 22782.

The product of its (nonzero) digits is 72, while the sum is 15.

The square root of 81003003 is about 9000.1668317871. The cubic root of 81003003 is about 432.6802180329.

The spelling of 81003003 in words is "eighty-one million, three thousand, three".