2238185309 has 2 divisors, whose sum is σ = 2238185310. Its totient is φ = 2238185308.

The previous prime is 2238185293. The next prime is 2238185311. The reversal of 2238185309 is 9035818322.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1976069209 + 262116100 = 44453^2 + 16190^2 .

It is a cyclic number.

It is not a de Polignac number, because 2238185309 - 2⁴ = 2238185293 is a prime.

Together with 2238185311, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2238185909) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1119092654 + 1119092655.

It is an arithmetic number, because the mean of its divisors is an integer number (1119092655).

Almost surely, 2^2238185309 is an apocalyptic number.

It is an amenable number.

2238185309 is a deficient number, since it is larger than the sum of its proper divisors (1).

2238185309 is an equidigital number, since it uses as much as digits as its factorization.

2238185309 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 103680, while the sum is 41.

The square root of 2238185309 is about 47309.4632076924. The cubic root of 2238185309 is about 1308.0730967965.

The spelling of 2238185309 in words is "two billion, two hundred thirty-eight million, one hundred eighty-five thousand, three hundred nine".