238149391 has 2 divisors, whose sum is σ = 238149392. Its totient is φ = 238149390.

The previous prime is 238149389. The next prime is 238149397. The reversal of 238149391 is 193941832.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 238149391 - 2¹ = 238149389 is a prime.

Together with 238149389, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (238149397) 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, 119074695 + 119074696.

It is an arithmetic number, because the mean of its divisors is an integer number (119074696).

Almost surely, 2^238149391 is an apocalyptic number.

238149391 is a deficient number, since it is larger than the sum of its proper divisors (1).

238149391 is an equidigital number, since it uses as much as digits as its factorization.

238149391 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 46656, while the sum is 40.

The square root of 238149391 is about 15432.0896511134. The cubic root of 238149391 is about 619.8450800931.

The spelling of 238149391 in words is "two hundred thirty-eight million, one hundred forty-nine thousand, three hundred ninety-one".