80643217 has 2 divisors, whose sum is σ = 80643218. Its totient is φ = 80643216.

The previous prime is 80643209. The next prime is 80643253. The reversal of 80643217 is 71234608.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 74926336 + 5716881 = 8656^2 + 2391^2 .

It is a cyclic number.

It is not a de Polignac number, because 80643217 - 2³ = 80643209 is a prime.

It is not a weakly prime, because it can be changed into another prime (80643517) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 40321608 + 40321609.

It is an arithmetic number, because the mean of its divisors is an integer number (40321609).

Almost surely, 2^80643217 is an apocalyptic number.

It is an amenable number.

80643217 is a deficient number, since it is larger than the sum of its proper divisors (1).

80643217 is an equidigital number, since it uses as much as digits as its factorization.

80643217 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 8064, while the sum is 31.

The square root of 80643217 is about 8980.1568471826. The cubic root of 80643217 is about 432.0386643063.

The spelling of 80643217 in words is "eighty million, six hundred forty-three thousand, two hundred seventeen".