82111109 has 2 divisors, whose sum is σ = 82111110. Its totient is φ = 82111108.

The previous prime is 82111097. The next prime is 82111147. The reversal of 82111109 is 90111128.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 56325025 + 25786084 = 7505^2 + 5078^2 .

It is a cyclic number.

It is not a de Polignac number, because 82111109 - 2¹⁶ = 82045573 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (82111709) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 41055554 + 41055555.

It is an arithmetic number, because the mean of its divisors is an integer number (41055555).

Almost surely, 2^82111109 is an apocalyptic number.

It is an amenable number.

82111109 is a deficient number, since it is larger than the sum of its proper divisors (1).

82111109 is an equidigital number, since it uses as much as digits as its factorization.

82111109 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 144, while the sum is 23.

The square root of 82111109 is about 9061.5180295577. The cubic root of 82111109 is about 434.6442839975.

The spelling of 82111109 in words is "eighty-two million, one hundred eleven thousand, one hundred nine".