82167809 has 2 divisors, whose sum is σ = 82167810. Its totient is φ = 82167808.

The previous prime is 82167791. The next prime is 82167823. The reversal of 82167809 is 90876128.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 75777025 + 6390784 = 8705^2 + 2528^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-82167809 is a prime.

It is not a weakly prime, because it can be changed into another prime (82167829) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 41083904 + 41083905.

It is an arithmetic number, because the mean of its divisors is an integer number (41083905).

Almost surely, 2^82167809 is an apocalyptic number.

It is an amenable number.

82167809 is a deficient number, since it is larger than the sum of its proper divisors (1).

82167809 is an equidigital number, since it uses as much as digits as its factorization.

82167809 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 82167809 is about 9064.6461045095. The cubic root of 82167809 is about 434.7443056261.

The spelling of 82167809 in words is "eighty-two million, one hundred sixty-seven thousand, eight hundred nine".