238128431 has 2 divisors, whose sum is σ = 238128432. Its totient is φ = 238128430.

The previous prime is 238128419. The next prime is 238128433. The reversal of 238128431 is 134821832.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 238128431 - 2²⁶ = 171019567 is a prime.

It is a super-2 number, since 2×238128431² = 113410299301043522, which contains 22 as substring.

Together with 238128433, 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 (238128433) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 119064215 + 119064216.

It is an arithmetic number, because the mean of its divisors is an integer number (119064216).

Almost surely, 2^238128431 is an apocalyptic number.

238128431 is a deficient number, since it is larger than the sum of its proper divisors (1).

238128431 is an equidigital number, since it uses as much as digits as its factorization.

238128431 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 9216, while the sum is 32.

The square root of 238128431 is about 15431.4105317693. The cubic root of 238128431 is about 619.8268949615.

The spelling of 238128431 in words is "two hundred thirty-eight million, one hundred twenty-eight thousand, four hundred thirty-one".