250530209 has 2 divisors, whose sum is σ = 250530210. Its totient is φ = 250530208.

The previous prime is 250530199. The next prime is 250530211. The reversal of 250530209 is 902035052.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 202435984 + 48094225 = 14228^2 + 6935^2 .

It is a cyclic number.

It is not a de Polignac number, because 250530209 - 2²⁰ = 249481633 is a prime.

Together with 250530211, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (250530229) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 125265104 + 125265105.

It is an arithmetic number, because the mean of its divisors is an integer number (125265105).

Almost surely, 2^250530209 is an apocalyptic number.

It is an amenable number.

250530209 is a deficient number, since it is larger than the sum of its proper divisors (1).

250530209 is an equidigital number, since it uses as much as digits as its factorization.

250530209 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2700, while the sum is 26.

The square root of 250530209 is about 15828.1461011705. The cubic root of 250530209 is about 630.4055581347.

The spelling of 250530209 in words is "two hundred fifty million, five hundred thirty thousand, two hundred nine".