81134171 has 4 divisors (see below), whose sum is σ = 82245672. Its totient is φ = 80022672.

The previous prime is 81134167. The next prime is 81134177. The reversal of 81134171 is 17143118.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 81134171 - 2² = 81134167 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 81134171.

It is not an unprimeable number, because it can be changed into a prime (81134177) 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, 555641 + ... + 555786.

It is an arithmetic number, because the mean of its divisors is an integer number (20561418).

Almost surely, 2^81134171 is an apocalyptic number.

81134171 is a deficient number, since it is larger than the sum of its proper divisors (1111501).

81134171 is a wasteful number, since it uses less digits than its factorization.

81134171 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1111500.

The product of its digits is 672, while the sum is 26.

The square root of 81134171 is about 9007.4508602601. The cubic root of 81134171 is about 432.9136381552.

Adding to 81134171 its reverse (17143118), we get a palindrome (98277289).

The spelling of 81134171 in words is "eighty-one million, one hundred thirty-four thousand, one hundred seventy-one".