82221973 has 2 divisors, whose sum is σ = 82221974. Its totient is φ = 82221972.

The previous prime is 82221967. The next prime is 82221991. The reversal of 82221973 is 37912228.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 76160529 + 6061444 = 8727^2 + 2462^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-82221973 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (82228973) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 41110986 + 41110987.

It is an arithmetic number, because the mean of its divisors is an integer number (41110987).

Almost surely, 2^82221973 is an apocalyptic number.

It is an amenable number.

82221973 is a deficient number, since it is larger than the sum of its proper divisors (1).

82221973 is an equidigital number, since it uses as much as digits as its factorization.

82221973 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 12096, while the sum is 34.

The square root of 82221973 is about 9067.6332634266. The cubic root of 82221973 is about 434.8398106610.

The spelling of 82221973 in words is "eighty-two million, two hundred twenty-one thousand, nine hundred seventy-three".