81070063 has 2 divisors, whose sum is σ = 81070064. Its totient is φ = 81070062.

The previous prime is 81070057. The next prime is 81070097. The reversal of 81070063 is 36007018.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-81070063 is a prime.

It is a super-2 number, since 2×81070063² = 13144710229647938, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (81070163) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 40535031 + 40535032.

It is an arithmetic number, because the mean of its divisors is an integer number (40535032).

Almost surely, 2^81070063 is an apocalyptic number.

81070063 is a deficient number, since it is larger than the sum of its proper divisors (1).

81070063 is an equidigital number, since it uses as much as digits as its factorization.

81070063 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1008, while the sum is 25.

The square root of 81070063 is about 9003.8915475476. The cubic root of 81070063 is about 432.7995861674.

The spelling of 81070063 in words is "eighty-one million, seventy thousand, sixty-three".