82151171 has 4 divisors (see below), whose sum is σ = 84984000. Its totient is φ = 79318344.

The previous prime is 82151131. The next prime is 82151177. The reversal of 82151171 is 17115128.

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 82151171 - 2¹⁰ = 82150147 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 82151171.

It is not an unprimeable number, because it can be changed into a prime (82151177) 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, 1416371 + ... + 1416428.

It is an arithmetic number, because the mean of its divisors is an integer number (21246000).

Almost surely, 2^82151171 is an apocalyptic number.

82151171 is a deficient number, since it is larger than the sum of its proper divisors (2832829).

82151171 is a wasteful number, since it uses less digits than its factorization.

82151171 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2832828.

The product of its digits is 560, while the sum is 26.

The square root of 82151171 is about 9063.7283167580. The cubic root of 82151171 is about 434.7149601354.

Adding to 82151171 its reverse (17115128), we get a palindrome (99266299).

The spelling of 82151171 in words is "eighty-two million, one hundred fifty-one thousand, one hundred seventy-one".