82111689 has 18 divisors (see below), whose sum is σ = 130370058. Its totient is φ = 49764000.

The previous prime is 82111669. The next prime is 82111697. The reversal of 82111689 is 98611128.

It can be written as a sum of positive squares in only one way, i.e., 65367225 + 16744464 = 8085^2 + 4092^2 .

It is not a de Polignac number, because 82111689 - 2¹¹ = 82109641 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (82111669) by changing a digit.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 36612 + ... + 38789.

It is an arithmetic number, because the mean of its divisors is an integer number (7242781).

Almost surely, 2^82111689 is an apocalyptic number.

It is an amenable number.

82111689 is a deficient number, since it is larger than the sum of its proper divisors (48258369).

82111689 is a wasteful number, since it uses less digits than its factorization.

82111689 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 75429 (or 75415 counting only the distinct ones).

The product of its digits is 6912, while the sum is 36.

The square root of 82111689 is about 9061.5500329690. The cubic root of 82111689 is about 434.6453073795.

The spelling of 82111689 in words is "eighty-two million, one hundred eleven thousand, six hundred eighty-nine".