82209971 has 2 divisors, whose sum is σ = 82209972. Its totient is φ = 82209970.

The previous prime is 82209947. The next prime is 82209973. The reversal of 82209971 is 17990228.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 82209971 - 2²² = 78015667 is a prime.

Together with 82209973, 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 (82209973) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 41104985 + 41104986.

It is an arithmetic number, because the mean of its divisors is an integer number (41104986).

Almost surely, 2^82209971 is an apocalyptic number.

82209971 is a deficient number, since it is larger than the sum of its proper divisors (1).

82209971 is an equidigital number, since it uses as much as digits as its factorization.

82209971 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 18144, while the sum is 38.

The square root of 82209971 is about 9066.9714348287. The cubic root of 82209971 is about 434.8186516724.

The spelling of 82209971 in words is "eighty-two million, two hundred nine thousand, nine hundred seventy-one".