280295993 has 2 divisors, whose sum is σ = 280295994. Its totient is φ = 280295992.

The previous prime is 280295957. The next prime is 280296013. The reversal of 280295993 is 399592082.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 247999504 + 32296489 = 15748^2 + 5683^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-280295993 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 (280295293) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 140147996 + 140147997.

It is an arithmetic number, because the mean of its divisors is an integer number (140147997).

Almost surely, 2^280295993 is an apocalyptic number.

It is an amenable number.

280295993 is a deficient number, since it is larger than the sum of its proper divisors (1).

280295993 is an equidigital number, since it uses as much as digits as its factorization.

280295993 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 349920, while the sum is 47.

The square root of 280295993 is about 16742.0426770451. The cubic root of 280295993 is about 654.4437076946.

The spelling of 280295993 in words is "two hundred eighty million, two hundred ninety-five thousand, nine hundred ninety-three".