82421947 has 2 divisors, whose sum is σ = 82421948. Its totient is φ = 82421946.

The previous prime is 82421929. The next prime is 82421951. The reversal of 82421947 is 74912428.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 82421947 - 2⁷ = 82421819 is a prime.

It is not a weakly prime, because it can be changed into another prime (82421917) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 41210973 + 41210974.

It is an arithmetic number, because the mean of its divisors is an integer number (41210974).

Almost surely, 2^82421947 is an apocalyptic number.

82421947 is a deficient number, since it is larger than the sum of its proper divisors (1).

82421947 is an equidigital number, since it uses as much as digits as its factorization.

82421947 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 32256, while the sum is 37.

The square root of 82421947 is about 9078.6533693054. The cubic root of 82421947 is about 435.1920533028.

The spelling of 82421947 in words is "eighty-two million, four hundred twenty-one thousand, nine hundred forty-seven".