81010603 has 2 divisors, whose sum is σ = 81010604. Its totient is φ = 81010602.

The previous prime is 81010591. The next prime is 81010607. The reversal of 81010603 is 30601018.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-81010603 is a prime.

It is not a weakly prime, because it can be changed into another prime (81010607) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 40505301 + 40505302.

It is an arithmetic number, because the mean of its divisors is an integer number (40505302).

Almost surely, 2^81010603 is an apocalyptic number.

81010603 is a deficient number, since it is larger than the sum of its proper divisors (1).

81010603 is an equidigital number, since it uses as much as digits as its factorization.

81010603 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 144, while the sum is 19.

The square root of 81010603 is about 9000.5890362798. The cubic root of 81010603 is about 432.6937494934.

The spelling of 81010603 in words is "eighty-one million, ten thousand, six hundred three".