81818003 has 2 divisors, whose sum is σ = 81818004. Its totient is φ = 81818002.

The previous prime is 81817999. The next prime is 81818069. The reversal of 81818003 is 30081818.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 81818003 - 2² = 81817999 is a prime.

It is a super-2 number, since 2×81818003² = 13388371229816018, which contains 22 as substring.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (81811003) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 40909001 + 40909002.

It is an arithmetic number, because the mean of its divisors is an integer number (40909002).

Almost surely, 2^81818003 is an apocalyptic number.

81818003 is a deficient number, since it is larger than the sum of its proper divisors (1).

81818003 is an equidigital number, since it uses as much as digits as its factorization.

81818003 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1536, while the sum is 29.

The square root of 81818003 is about 9045.3304527806. The cubic root of 81818003 is about 434.1264948020.

The spelling of 81818003 in words is "eighty-one million, eight hundred eighteen thousand, three".