238531 has 2 divisors, whose sum is σ = 238532. Its totient is φ = 238530.

The previous prime is 238529. The next prime is 238547. The reversal of 238531 is 135832.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 238531 - 2¹ = 238529 is a prime.

It is a super-2 number, since 2×238531² = 113794075922, which contains 22 as substring.

Together with 238529, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (238591) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 119265 + 119266.

It is an arithmetic number, because the mean of its divisors is an integer number (119266).

2²³⁸⁵³¹ is an apocalyptic number.

238531 is a deficient number, since it is larger than the sum of its proper divisors (1).

238531 is an equidigital number, since it uses as much as digits as its factorization.

238531 is an evil number, because the sum of its binary digits is even.

The product of its digits is 720, while the sum is 22.

The square root of 238531 is about 488.3963554328. The cubic root of 238531 is about 62.0175981955.

The spelling of 238531 in words is "two hundred thirty-eight thousand, five hundred thirty-one".