81232171 has 8 divisors (see below), whose sum is σ = 86115744. Its totient is φ = 76360320.

The previous prime is 81232157. The next prime is 81232211. The reversal of 81232171 is 17123218.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 81232171 - 2¹⁵ = 81199403 is a prime.

It is not an unprimeable number, because it can be changed into a prime (81236171) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 14281 + ... + 19141.

It is an arithmetic number, because the mean of its divisors is an integer number (10764468).

Almost surely, 2^81232171 is an apocalyptic number.

81232171 is a deficient number, since it is larger than the sum of its proper divisors (4883573).

81232171 is a wasteful number, since it uses less digits than its factorization.

81232171 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5861.

The product of its digits is 672, while the sum is 25.

The square root of 81232171 is about 9012.8891594205. The cubic root of 81232171 is about 433.0878699898.

Adding to 81232171 its reverse (17123218), we get a palindrome (98355389).

It can be divided in two parts, 8123217 and 1, that added together give a palindrome (8123218).

The spelling of 81232171 in words is "eighty-one million, two hundred thirty-two thousand, one hundred seventy-one".