80173021 has 2 divisors, whose sum is σ = 80173022. Its totient is φ = 80173020.

The previous prime is 80173013. The next prime is 80173033. The reversal of 80173021 is 12037108.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 70476025 + 9696996 = 8395^2 + 3114^2 .

It is a cyclic number.

It is not a de Polignac number, because 80173021 - 2³ = 80173013 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 80172983 and 80173001.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (80173091) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 40086510 + 40086511.

It is an arithmetic number, because the mean of its divisors is an integer number (40086511).

Almost surely, 2^80173021 is an apocalyptic number.

It is an amenable number.

80173021 is a deficient number, since it is larger than the sum of its proper divisors (1).

80173021 is an equidigital number, since it uses as much as digits as its factorization.

80173021 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 336, while the sum is 22.

The square root of 80173021 is about 8953.9388539346. The cubic root of 80173021 is about 431.1973497020.

The spelling of 80173021 in words is "eighty million, one hundred seventy-three thousand, twenty-one".