82797809 has 2 divisors, whose sum is σ = 82797810. Its totient is φ = 82797808.

The previous prime is 82797797. The next prime is 82797811. The reversal of 82797809 is 90879728.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 79263409 + 3534400 = 8903^2 + 1880^2 .

It is a cyclic number.

It is not a de Polignac number, because 82797809 - 2⁸ = 82797553 is a prime.

Together with 82797811, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (82797829) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 41398904 + 41398905.

It is an arithmetic number, because the mean of its divisors is an integer number (41398905).

Almost surely, 2^82797809 is an apocalyptic number.

It is an amenable number.

82797809 is a deficient number, since it is larger than the sum of its proper divisors (1).

82797809 is an equidigital number, since it uses as much as digits as its factorization.

82797809 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 508032, while the sum is 50.

The square root of 82797809 is about 9099.3301401806. The cubic root of 82797809 is about 435.8525737425.

The spelling of 82797809 in words is "eighty-two million, seven hundred ninety-seven thousand, eight hundred nine".