238228931 has 2 divisors, whose sum is σ = 238228932. Its totient is φ = 238228930.

The previous prime is 238228919. The next prime is 238228933. The reversal of 238228931 is 139822832.

238228931 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 238228931 - 2²² = 234034627 is a prime.

It is a super-2 number, since 2×238228931² = 113506047130805522, which contains 22 as substring.

Together with 238228933, 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 (238228933) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 119114465 + 119114466.

It is an arithmetic number, because the mean of its divisors is an integer number (119114466).

Almost surely, 2^238228931 is an apocalyptic number.

238228931 is a deficient number, since it is larger than the sum of its proper divisors (1).

238228931 is an equidigital number, since it uses as much as digits as its factorization.

238228931 is an evil number, because the sum of its binary digits is even.

The product of its digits is 41472, while the sum is 38.

The square root of 238228931 is about 15434.6665334888. Note that the first 3 decimals coincide. The cubic root of 238228931 is about 619.9140801853.

It can be divided in two parts, 2382 and 28931, that added together give a palindrome (31313).

The spelling of 238228931 in words is "two hundred thirty-eight million, two hundred twenty-eight thousand, nine hundred thirty-one".