81367163 has 2 divisors, whose sum is σ = 81367164. Its totient is φ = 81367162.

The previous prime is 81367147. The next prime is 81367211. The reversal of 81367163 is 36176318.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 81367163 - 2⁴ = 81367147 is a prime.

It is not a weakly prime, because it can be changed into another prime (81367103) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 40683581 + 40683582.

It is an arithmetic number, because the mean of its divisors is an integer number (40683582).

Almost surely, 2^81367163 is an apocalyptic number.

81367163 is a deficient number, since it is larger than the sum of its proper divisors (1).

81367163 is an equidigital number, since it uses as much as digits as its factorization.

81367163 is an evil number, because the sum of its binary digits is even.

The product of its digits is 18144, while the sum is 35.

The square root of 81367163 is about 9020.3748813450. The cubic root of 81367163 is about 433.3276397017.

It can be divided in two parts, 813 and 67163, that added together give a palindrome (67976).

The spelling of 81367163 in words is "eighty-one million, three hundred sixty-seven thousand, one hundred sixty-three".