80822821 has 2 divisors, whose sum is σ = 80822822. Its totient is φ = 80822820.

The previous prime is 80822773. The next prime is 80822831. The reversal of 80822821 is 12822808.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 77193796 + 3629025 = 8786^2 + 1905^2 .

It is a cyclic number.

It is not a de Polignac number, because 80822821 - 2⁹ = 80822309 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (80822831) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 40411410 + 40411411.

It is an arithmetic number, because the mean of its divisors is an integer number (40411411).

Almost surely, 2^80822821 is an apocalyptic number.

It is an amenable number.

80822821 is a deficient number, since it is larger than the sum of its proper divisors (1).

80822821 is an equidigital number, since it uses as much as digits as its factorization.

80822821 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 4096, while the sum is 31.

The square root of 80822821 is about 8990.1513335427. The cubic root of 80822821 is about 432.3591638293.

The spelling of 80822821 in words is "eighty million, eight hundred twenty-two thousand, eight hundred twenty-one".