82687109 has 2 divisors, whose sum is σ = 82687110. Its totient is φ = 82687108.

The previous prime is 82687079. The next prime is 82687117. The reversal of 82687109 is 90178628.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 70190884 + 12496225 = 8378^2 + 3535^2 .

It is a cyclic number.

It is not a de Polignac number, because 82687109 - 2¹⁶ = 82621573 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 (82687159) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 41343554 + 41343555.

It is an arithmetic number, because the mean of its divisors is an integer number (41343555).

Almost surely, 2^82687109 is an apocalyptic number.

It is an amenable number.

82687109 is a deficient number, since it is larger than the sum of its proper divisors (1).

82687109 is an equidigital number, since it uses as much as digits as its factorization.

82687109 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 48384, while the sum is 41.

The square root of 82687109 is about 9093.2452402869. The cubic root of 82687109 is about 435.6582433238.

The spelling of 82687109 in words is "eighty-two million, six hundred eighty-seven thousand, one hundred nine".