82207891 has 2 divisors, whose sum is σ = 82207892. Its totient is φ = 82207890.

The previous prime is 82207883. The next prime is 82207897. The reversal of 82207891 is 19870228.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 82207891 - 2³ = 82207883 is a prime.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 82207891.

It is not a weakly prime, because it can be changed into another prime (82207897) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 41103945 + 41103946.

It is an arithmetic number, because the mean of its divisors is an integer number (41103946).

Almost surely, 2^82207891 is an apocalyptic number.

82207891 is a deficient number, since it is larger than the sum of its proper divisors (1).

82207891 is an equidigital number, since it uses as much as digits as its factorization.

82207891 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 16128, while the sum is 37.

The square root of 82207891 is about 9066.8567320764. The cubic root of 82207891 is about 434.8149845162.

The spelling of 82207891 in words is "eighty-two million, two hundred seven thousand, eight hundred ninety-one".