82209947 has 2 divisors, whose sum is σ = 82209948. Its totient is φ = 82209946.

The previous prime is 82209929. The next prime is 82209971. The reversal of 82209947 is 74990228.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 82209947 - 2²² = 78015643 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (82209247) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 41104973 + 41104974.

It is an arithmetic number, because the mean of its divisors is an integer number (41104974).

Almost surely, 2^82209947 is an apocalyptic number.

82209947 is a deficient number, since it is larger than the sum of its proper divisors (1).

82209947 is an equidigital number, since it uses as much as digits as its factorization.

82209947 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 72576, while the sum is 41.

The square root of 82209947 is about 9066.9701113437. The cubic root of 82209947 is about 434.8186093594.

The spelling of 82209947 in words is "eighty-two million, two hundred nine thousand, nine hundred forty-seven".