81003187 has 2 divisors, whose sum is σ = 81003188. Its totient is φ = 81003186.

The previous prime is 81003179. The next prime is 81003229. The reversal of 81003187 is 78130018.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 81003187 - 2³ = 81003179 is a prime.

It is not a weakly prime, because it can be changed into another prime (81003107) 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 as a sum of consecutive naturals, namely, 40501593 + 40501594.

It is an arithmetic number, because the mean of its divisors is an integer number (40501594).

Almost surely, 2^81003187 is an apocalyptic number.

81003187 is a deficient number, since it is larger than the sum of its proper divisors (1).

81003187 is an equidigital number, since it uses as much as digits as its factorization.

81003187 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1344, while the sum is 28.

The square root of 81003187 is about 9000.1770538140. The cubic root of 81003187 is about 432.6805456467.

The spelling of 81003187 in words is "eighty-one million, three thousand, one hundred eighty-seven".