243250109 has 4 divisors (see below), whose sum is σ = 243319104. Its totient is φ = 243181116.

The previous prime is 243250079. The next prime is 243250153. The reversal of 243250109 is 901052342.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-243250109 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (243250199) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 28907 + ... + 36360.

It is an arithmetic number, because the mean of its divisors is an integer number (60829776).

Almost surely, 2^243250109 is an apocalyptic number.

It is an amenable number.

243250109 is a deficient number, since it is larger than the sum of its proper divisors (68995).

243250109 is an equidigital number, since it uses as much as digits as its factorization.

243250109 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 68994.

The product of its (nonzero) digits is 2160, while the sum is 26.

The square root of 243250109 is about 15596.4774548614. The cubic root of 243250109 is about 624.2391672027.

The spelling of 243250109 in words is "two hundred forty-three million, two hundred fifty thousand, one hundred nine".