249870017 has 2 divisors, whose sum is σ = 249870018. Its totient is φ = 249870016.

The previous prime is 249869989. The next prime is 249870077. The reversal of 249870017 is 710078942.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 224880016 + 24990001 = 14996^2 + 4999^2 .

It is a cyclic number.

It is not a de Polignac number, because 249870017 - 2⁸ = 249869761 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (249870077) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 124935008 + 124935009.

It is an arithmetic number, because the mean of its divisors is an integer number (124935009).

Almost surely, 2^249870017 is an apocalyptic number.

It is an amenable number.

249870017 is a deficient number, since it is larger than the sum of its proper divisors (1).

249870017 is an equidigital number, since it uses as much as digits as its factorization.

249870017 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 28224, while the sum is 38.

The square root of 249870017 is about 15807.2773430468. The cubic root of 249870017 is about 629.8513271416.

The spelling of 249870017 in words is "two hundred forty-nine million, eight hundred seventy thousand, seventeen".