82120847 has 2 divisors, whose sum is σ = 82120848. Its totient is φ = 82120846.

The previous prime is 82120817. The next prime is 82120939. The reversal of 82120847 is 74802128.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-82120847 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 (82120807) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 41060423 + 41060424.

It is an arithmetic number, because the mean of its divisors is an integer number (41060424).

Almost surely, 2^82120847 is an apocalyptic number.

82120847 is a deficient number, since it is larger than the sum of its proper divisors (1).

82120847 is an equidigital number, since it uses as much as digits as its factorization.

82120847 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 7168, while the sum is 32.

The square root of 82120847 is about 9062.0553408153. The cubic root of 82120847 is about 434.6614655896.

The spelling of 82120847 in words is "eighty-two million, one hundred twenty thousand, eight hundred forty-seven".