81250171 has 4 divisors (see below), whose sum is σ = 81268200. Its totient is φ = 81232144.

The previous prime is 81250153. The next prime is 81250193. The reversal of 81250171 is 17105218.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 81250171 - 2¹⁵ = 81217403 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (81254171) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4440 + ... + 13498.

It is an arithmetic number, because the mean of its divisors is an integer number (20317050).

Almost surely, 2^81250171 is an apocalyptic number.

81250171 is a deficient number, since it is larger than the sum of its proper divisors (18029).

81250171 is an equidigital number, since it uses as much as digits as its factorization.

81250171 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18028.

The product of its (nonzero) digits is 560, while the sum is 25.

The square root of 81250171 is about 9013.8876740283. The cubic root of 81250171 is about 433.1198565203.

Adding to 81250171 its reverse (17105218), we get a palindrome (98355389).

The spelling of 81250171 in words is "eighty-one million, two hundred fifty thousand, one hundred seventy-one".