81502381003 has 2 divisors, whose sum is σ = 81502381004. Its totient is φ = 81502381002.

The previous prime is 81502380997. The next prime is 81502381007. The reversal of 81502381003 is 30018320518.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 81502381003 - 2¹⁷ = 81502249931 is a prime.

It is not a weakly prime, because it can be changed into another prime (81502381007) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 40751190501 + 40751190502.

It is an arithmetic number, because the mean of its divisors is an integer number (40751190502).

Almost surely, 2^81502381003 is an apocalyptic number.

81502381003 is a deficient number, since it is larger than the sum of its proper divisors (1).

81502381003 is an equidigital number, since it uses as much as digits as its factorization.

81502381003 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 5760, while the sum is 31.

The spelling of 81502381003 in words is "eighty-one billion, five hundred two million, three hundred eighty-one thousand, three".