80721133 has 2 divisors, whose sum is σ = 80721134. Its totient is φ = 80721132.

The previous prime is 80721097. The next prime is 80721163. The reversal of 80721133 is 33112708.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 74874409 + 5846724 = 8653^2 + 2418^2 .

It is a cyclic number.

It is not a de Polignac number, because 80721133 - 2¹⁷ = 80590061 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 80721098 and 80721107.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (80721163) 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, 40360566 + 40360567.

It is an arithmetic number, because the mean of its divisors is an integer number (40360567).

Almost surely, 2^80721133 is an apocalyptic number.

It is an amenable number.

80721133 is a deficient number, since it is larger than the sum of its proper divisors (1).

80721133 is an equidigital number, since it uses as much as digits as its factorization.

80721133 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1008, while the sum is 25.

The square root of 80721133 is about 8984.4940313854. The cubic root of 80721133 is about 432.1777621342.

The spelling of 80721133 in words is "eighty million, seven hundred twenty-one thousand, one hundred thirty-three".