81271063 has 2 divisors, whose sum is σ = 81271064. Its totient is φ = 81271062.

The previous prime is 81271031. The next prime is 81271111. The reversal of 81271063 is 36017218.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 81271063 - 2⁵ = 81271031 is a prime.

It is a super-2 number, since 2×81271063² = 13209971362299938, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (81271363) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 40635531 + 40635532.

It is an arithmetic number, because the mean of its divisors is an integer number (40635532).

Almost surely, 2^81271063 is an apocalyptic number.

81271063 is a deficient number, since it is larger than the sum of its proper divisors (1).

81271063 is an equidigital number, since it uses as much as digits as its factorization.

81271063 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2016, while the sum is 28.

The square root of 81271063 is about 9015.0464779723. The cubic root of 81271063 is about 433.1569762968.

The spelling of 81271063 in words is "eighty-one million, two hundred seventy-one thousand, sixty-three".