238121911 has 2 divisors, whose sum is σ = 238121912. Its totient is φ = 238121910.

The previous prime is 238121893. The next prime is 238121957. The reversal of 238121911 is 119121832.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 238121911 - 2¹¹ = 238119863 is a prime.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 238121911.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (238131911) 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, 119060955 + 119060956.

It is an arithmetic number, because the mean of its divisors is an integer number (119060956).

Almost surely, 2^238121911 is an apocalyptic number.

238121911 is a deficient number, since it is larger than the sum of its proper divisors (1).

238121911 is an equidigital number, since it uses as much as digits as its factorization.

238121911 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 864, while the sum is 28.

The square root of 238121911 is about 15431.1992729016. The cubic root of 238121911 is about 619.8212379186.

The spelling of 238121911 in words is "two hundred thirty-eight million, one hundred twenty-one thousand, nine hundred eleven".