80858821 has 2 divisors, whose sum is σ = 80858822. Its totient is φ = 80858820.

The previous prime is 80858809. The next prime is 80858837. The reversal of 80858821 is 12885808.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 62489025 + 18369796 = 7905^2 + 4286^2 .

It is a cyclic number.

It is not a de Polignac number, because 80858821 - 2⁷ = 80858693 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (80858861) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 40429410 + 40429411.

It is an arithmetic number, because the mean of its divisors is an integer number (40429411).

Almost surely, 2^80858821 is an apocalyptic number.

It is an amenable number.

80858821 is a deficient number, since it is larger than the sum of its proper divisors (1).

80858821 is an equidigital number, since it uses as much as digits as its factorization.

80858821 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 40960, while the sum is 40.

The square root of 80858821 is about 8992.1533016291. The cubic root of 80858821 is about 432.4233479269.

The spelling of 80858821 in words is "eighty million, eight hundred fifty-eight thousand, eight hundred twenty-one".