80073781 has 2 divisors, whose sum is σ = 80073782. Its totient is φ = 80073780.

The previous prime is 80073761. The next prime is 80073817. The reversal of 80073781 is 18737008.

It is a happy number.

Together with next prime (80073817) it forms an Ormiston pair, because they use the same digits, order apart.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 63345681 + 16728100 = 7959^2 + 4090^2 .

It is a cyclic number.

It is not a de Polignac number, because 80073781 - 2¹³ = 80065589 is a prime.

It is a super-2 number, since 2×80073781² = 12823620807271922, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (80073701) 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, 40036890 + 40036891.

It is an arithmetic number, because the mean of its divisors is an integer number (40036891).

Almost surely, 2^80073781 is an apocalyptic number.

It is an amenable number.

80073781 is a deficient number, since it is larger than the sum of its proper divisors (1).

80073781 is an equidigital number, since it uses as much as digits as its factorization.

80073781 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 9408, while the sum is 34.

The square root of 80073781 is about 8948.3954427596. The cubic root of 80073781 is about 431.0193609267.

The spelling of 80073781 in words is "eighty million, seventy-three thousand, seven hundred eighty-one".