82129121 has 8 divisors (see below), whose sum is σ = 83669760. Its totient is φ = 80593552.

The previous prime is 82129087. The next prime is 82129129. The reversal of 82129121 is 12192128.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-82129121 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (82129129) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 50111 + ... + 51723.

It is an arithmetic number, because the mean of its divisors is an integer number (10458720).

Almost surely, 2^82129121 is an apocalyptic number.

It is an amenable number.

82129121 is a deficient number, since it is larger than the sum of its proper divisors (1540639).

82129121 is a wasteful number, since it uses less digits than its factorization.

82129121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2535.

The product of its digits is 576, while the sum is 26.

The square root of 82129121 is about 9062.5118482681. The cubic root of 82129121 is about 434.6760630530.

The spelling of 82129121 in words is "eighty-two million, one hundred twenty-nine thousand, one hundred twenty-one".