81463271 has 2 divisors, whose sum is σ = 81463272. Its totient is φ = 81463270.

The previous prime is 81463259. The next prime is 81463297. The reversal of 81463271 is 17236418.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-81463271 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (81463211) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 40731635 + 40731636.

It is an arithmetic number, because the mean of its divisors is an integer number (40731636).

Almost surely, 2^81463271 is an apocalyptic number.

81463271 is a deficient number, since it is larger than the sum of its proper divisors (1).

81463271 is an equidigital number, since it uses as much as digits as its factorization.

81463271 is an evil number, because the sum of its binary digits is even.

The product of its digits is 8064, while the sum is 32.

The square root of 81463271 is about 9025.7005822263. The cubic root of 81463271 is about 433.4981829732.

Adding to 81463271 its reverse (17236418), we get a palindrome (98699689).

The spelling of 81463271 in words is "eighty-one million, four hundred sixty-three thousand, two hundred seventy-one".