279720317 has 2 divisors, whose sum is σ = 279720318. Its totient is φ = 279720316.

The previous prime is 279720281. The next prime is 279720383. The reversal of 279720317 is 713027972.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 212168356 + 67551961 = 14566^2 + 8219^2 .

It is a cyclic number.

It is not a de Polignac number, because 279720317 - 2¹² = 279716221 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (279720017) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 139860158 + 139860159.

It is an arithmetic number, because the mean of its divisors is an integer number (139860159).

Almost surely, 2^279720317 is an apocalyptic number.

It is an amenable number.

279720317 is a deficient number, since it is larger than the sum of its proper divisors (1).

279720317 is an equidigital number, since it uses as much as digits as its factorization.

279720317 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 37044, while the sum is 38.

The square root of 279720317 is about 16724.8413146433. The cubic root of 279720317 is about 653.9953652719.

The spelling of 279720317 in words is "two hundred seventy-nine million, seven hundred twenty thousand, three hundred seventeen".