82111129 has 4 divisors (see below), whose sum is σ = 82130020. Its totient is φ = 82092240.

The previous prime is 82111109. The next prime is 82111147. The reversal of 82111129 is 92111128.

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

It can be written as a sum of positive squares in 2 ways, for example, as 66389904 + 15721225 = 8148^2 + 3965^2 .

It is a cyclic number.

It is not a de Polignac number, because 82111129 - 2⁵ = 82111097 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (82111109) 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, 727 + ... + 12835.

It is an arithmetic number, because the mean of its divisors is an integer number (20532505).

Almost surely, 2^82111129 is an apocalyptic number.

It is an amenable number.

82111129 is a deficient number, since it is larger than the sum of its proper divisors (18891).

82111129 is a wasteful number, since it uses less digits than its factorization.

82111129 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18890.

The product of its digits is 288, while the sum is 25.

The square root of 82111129 is about 9061.5191331255. The cubic root of 82111129 is about 434.6443192867.

Subtracting 82111129 from its reverse (92111128), we obtain a palindrome (9999999).

The spelling of 82111129 in words is "eighty-two million, one hundred eleven thousand, one hundred twenty-nine".