80821771 has 2 divisors, whose sum is σ = 80821772. Its totient is φ = 80821770.

The previous prime is 80821739. The next prime is 80821777. The reversal of 80821771 is 17712808.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 80821771 - 2⁵ = 80821739 is a prime.

It is equal to p_4714567 and since 80821771 and 4714567 have the same sum of digits, it is a Honaker prime.

It is not a weakly prime, because it can be changed into another prime (80821777) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 40410885 + 40410886.

It is an arithmetic number, because the mean of its divisors is an integer number (40410886).

Almost surely, 2^80821771 is an apocalyptic number.

80821771 is a deficient number, since it is larger than the sum of its proper divisors (1).

80821771 is an equidigital number, since it uses as much as digits as its factorization.

80821771 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 6272, while the sum is 34.

The square root of 80821771 is about 8990.0929361158. The cubic root of 80821771 is about 432.3572915070.

The spelling of 80821771 in words is "eighty million, eight hundred twenty-one thousand, seven hundred seventy-one".