249870109 has 2 divisors, whose sum is σ = 249870110. Its totient is φ = 249870108.

The previous prime is 249870079. The next prime is 249870191. The reversal of 249870109 is 901078942.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 249545209 + 324900 = 15797^2 + 570^2 .

It is a cyclic number.

It is not a de Polignac number, because 249870109 - 2⁵ = 249870077 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (249873109) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 124935054 + 124935055.

It is an arithmetic number, because the mean of its divisors is an integer number (124935055).

Almost surely, 2^249870109 is an apocalyptic number.

It is an amenable number.

249870109 is a deficient number, since it is larger than the sum of its proper divisors (1).

249870109 is an equidigital number, since it uses as much as digits as its factorization.

249870109 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 36288, while the sum is 40.

The square root of 249870109 is about 15807.2802530986. The cubic root of 249870109 is about 629.8514044435.

The spelling of 249870109 in words is "two hundred forty-nine million, eight hundred seventy thousand, one hundred nine".