280313993 has 2 divisors, whose sum is σ = 280313994. Its totient is φ = 280313992.

The previous prime is 280313989. The next prime is 280314017. The reversal of 280313993 is 399313082.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 166848889 + 113465104 = 12917^2 + 10652^2 .

It is a cyclic number.

It is not a de Polignac number, because 280313993 - 2² = 280313989 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (280313953) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 140156996 + 140156997.

It is an arithmetic number, because the mean of its divisors is an integer number (140156997).

Almost surely, 2^280313993 is an apocalyptic number.

It is an amenable number.

280313993 is a deficient number, since it is larger than the sum of its proper divisors (1).

280313993 is an equidigital number, since it uses as much as digits as its factorization.

280313993 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 34992, while the sum is 38.

The square root of 280313993 is about 16742.5802372275. The cubic root of 280313993 is about 654.4577163793.

The spelling of 280313993 in words is "two hundred eighty million, three hundred thirteen thousand, nine hundred ninety-three".