238249391 has 2 divisors, whose sum is σ = 238249392. Its totient is φ = 238249390.

The previous prime is 238249357. The next prime is 238249393. The reversal of 238249391 is 193942832.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 238249391 - 2¹⁴ = 238233007 is a prime.

It is a Sophie Germain prime.

Together with 238249393, 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 (238249393) 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, 119124695 + 119124696.

It is an arithmetic number, because the mean of its divisors is an integer number (119124696).

Almost surely, 2^238249391 is an apocalyptic number.

238249391 is a deficient number, since it is larger than the sum of its proper divisors (1).

238249391 is an equidigital number, since it uses as much as digits as its factorization.

238249391 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 93312, while the sum is 41.

The square root of 238249391 is about 15435.3293129755. The cubic root of 238249391 is about 619.9318265312.

The spelling of 238249391 in words is "two hundred thirty-eight million, two hundred forty-nine thousand, three hundred ninety-one".