82168109 has 4 divisors (see below), whose sum is σ = 82585404. Its totient is φ = 81750816.

The previous prime is 82168057. The next prime is 82168127. The reversal of 82168109 is 90186128.

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 37478884 + 44689225 = 6122^2 + 6685^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-82168109 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (82168169) 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, 208352 + ... + 208745.

It is an arithmetic number, because the mean of its divisors is an integer number (20646351).

Almost surely, 2^82168109 is an apocalyptic number.

It is an amenable number.

82168109 is a deficient number, since it is larger than the sum of its proper divisors (417295).

82168109 is a wasteful number, since it uses less digits than its factorization.

82168109 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 417294.

The product of its (nonzero) digits is 6912, while the sum is 35.

The square root of 82168109 is about 9064.6626522999. The cubic root of 82168109 is about 434.7448347187.

The spelling of 82168109 in words is "eighty-two million, one hundred sixty-eight thousand, one hundred nine".