249989717 has 2 divisors, whose sum is σ = 249989718. Its totient is φ = 249989716.

The previous prime is 249989713. The next prime is 249989731. The reversal of 249989717 is 717989942.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 192820996 + 57168721 = 13886^2 + 7561^2 .

It is a cyclic number.

It is not a de Polignac number, because 249989717 - 2² = 249989713 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (249989713) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 124994858 + 124994859.

It is an arithmetic number, because the mean of its divisors is an integer number (124994859).

Almost surely, 2^249989717 is an apocalyptic number.

It is an amenable number.

249989717 is a deficient number, since it is larger than the sum of its proper divisors (1).

249989717 is an equidigital number, since it uses as much as digits as its factorization.

249989717 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 2286144, while the sum is 56.

The square root of 249989717 is about 15811.0631204862. The cubic root of 249989717 is about 629.9518876502.

The spelling of 249989717 in words is "two hundred forty-nine million, nine hundred eighty-nine thousand, seven hundred seventeen".