80257781 has 2 divisors, whose sum is σ = 80257782. Its totient is φ = 80257780.

The previous prime is 80257757. The next prime is 80257783. The reversal of 80257781 is 18775208.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 62331025 + 17926756 = 7895^2 + 4234^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-80257781 is a prime.

It is a super-2 number, since 2×80257781² = 12882622822087922, which contains 22 as substring.

Together with 80257783, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (80257783) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 40128890 + 40128891.

It is an arithmetic number, because the mean of its divisors is an integer number (40128891).

Almost surely, 2^80257781 is an apocalyptic number.

It is an amenable number.

80257781 is a deficient number, since it is larger than the sum of its proper divisors (1).

80257781 is an equidigital number, since it uses as much as digits as its factorization.

80257781 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 31360, while the sum is 38.

The square root of 80257781 is about 8958.6707161275. The cubic root of 80257781 is about 431.3492520696.

The spelling of 80257781 in words is "eighty million, two hundred fifty-seven thousand, seven hundred eighty-one".