80530781 has 2 divisors, whose sum is σ = 80530782. Its totient is φ = 80530780.

The previous prime is 80530741. The next prime is 80530817. The reversal of 80530781 is 18703508.

Together with next prime (80530817) it forms an Ormiston pair, because they use the same digits, order apart.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 40322500 + 40208281 = 6350^2 + 6341^2 .

It is a cyclic number.

It is not a de Polignac number, because 80530781 - 2¹⁸ = 80268637 is a prime.

It is a super-2 number, since 2×80530781² = 12970413376939922, which contains 22 as substring.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (80530711) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 40265390 + 40265391.

It is an arithmetic number, because the mean of its divisors is an integer number (40265391).

Almost surely, 2^80530781 is an apocalyptic number.

It is an amenable number.

80530781 is a deficient number, since it is larger than the sum of its proper divisors (1).

80530781 is an equidigital number, since it uses as much as digits as its factorization.

80530781 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 6720, while the sum is 32.

The square root of 80530781 is about 8973.8944165841. The cubic root of 80530781 is about 431.8377823871.

The spelling of 80530781 in words is "eighty million, five hundred thirty thousand, seven hundred eighty-one".