80427821 has 2 divisors, whose sum is σ = 80427822. Its totient is φ = 80427820.

The previous prime is 80427769. The next prime is 80427827. The reversal of 80427821 is 12872408.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 43692100 + 36735721 = 6610^2 + 6061^2 .

It is a cyclic number.

It is not a de Polignac number, because 80427821 - 2¹⁴ = 80411437 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (80427827) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 40213910 + 40213911.

It is an arithmetic number, because the mean of its divisors is an integer number (40213911).

Almost surely, 2^80427821 is an apocalyptic number.

It is an amenable number.

80427821 is a deficient number, since it is larger than the sum of its proper divisors (1).

80427821 is an equidigital number, since it uses as much as digits as its factorization.

80427821 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 7168, while the sum is 32.

The square root of 80427821 is about 8968.1559419983. The cubic root of 80427821 is about 431.6536665352.

The spelling of 80427821 in words is "eighty million, four hundred twenty-seven thousand, eight hundred twenty-one".