280307081 has 2 divisors, whose sum is σ = 280307082. Its totient is φ = 280307080.

The previous prime is 280307059. The next prime is 280307117. The reversal of 280307081 is 180703082.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 253319056 + 26988025 = 15916^2 + 5195^2 .

It is a cyclic number.

It is not a de Polignac number, because 280307081 - 2¹⁴ = 280290697 is a prime.

It is a super-2 number, since 2×280307081² = 157144119317481122, which contains 22 as substring.

It is a Sophie Germain prime.

It is a Chen prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (280307051) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 140153540 + 140153541.

It is an arithmetic number, because the mean of its divisors is an integer number (140153541).

Almost surely, 2^280307081 is an apocalyptic number.

It is an amenable number.

280307081 is a deficient number, since it is larger than the sum of its proper divisors (1).

280307081 is an equidigital number, since it uses as much as digits as its factorization.

280307081 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2688, while the sum is 29.

The square root of 280307081 is about 16742.3738161588. The cubic root of 280307081 is about 654.4523371153.

The spelling of 280307081 in words is "two hundred eighty million, three hundred seven thousand, eighty-one".