81359271 has 24 divisors (see below), whose sum is σ = 134563104. Its totient is φ = 46402560.

The previous prime is 81359251. The next prime is 81359281. The reversal of 81359271 is 17295318.

It is not a de Polignac number, because 81359271 - 2⁶ = 81359207 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81359251) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 47095 + ... + 48791.

It is an arithmetic number, because the mean of its divisors is an integer number (5606796).

Almost surely, 2^81359271 is an apocalyptic number.

81359271 is a deficient number, since it is larger than the sum of its proper divisors (53203833).

81359271 is a wasteful number, since it uses less digits than its factorization.

81359271 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2471 (or 2468 counting only the distinct ones).

The product of its digits is 15120, while the sum is 36.

The square root of 81359271 is about 9019.9374166343. The cubic root of 81359271 is about 433.3136294131.

The spelling of 81359271 in words is "eighty-one million, three hundred fifty-nine thousand, two hundred seventy-one".