81282163 has 2 divisors, whose sum is σ = 81282164. Its totient is φ = 81282162.

The previous prime is 81282127. The next prime is 81282181. The reversal of 81282163 is 36128218.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 81282163 - 2²¹ = 79185011 is a prime.

It is not a weakly prime, because it can be changed into another prime (81282193) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 40641081 + 40641082.

It is an arithmetic number, because the mean of its divisors is an integer number (40641082).

Almost surely, 2^81282163 is an apocalyptic number.

81282163 is a deficient number, since it is larger than the sum of its proper divisors (1).

81282163 is an equidigital number, since it uses as much as digits as its factorization.

81282163 is an evil number, because the sum of its binary digits is even.

The product of its digits is 4608, while the sum is 31.

The square root of 81282163 is about 9015.6620943778. The cubic root of 81282163 is about 433.1766955892.

The spelling of 81282163 in words is "eighty-one million, two hundred eighty-two thousand, one hundred sixty-three".