238109831 has 2 divisors, whose sum is σ = 238109832. Its totient is φ = 238109830.

The previous prime is 238109827. The next prime is 238109857. The reversal of 238109831 is 138901832.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 238109831 - 2² = 238109827 is a prime.

It is a super-2 number, since 2×238109831² = 113392583237697122, which contains 22 as substring.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 238109791 and 238109800.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (238109801) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 119054915 + 119054916.

It is an arithmetic number, because the mean of its divisors is an integer number (119054916).

Almost surely, 2^238109831 is an apocalyptic number.

238109831 is a deficient number, since it is larger than the sum of its proper divisors (1).

238109831 is an equidigital number, since it uses as much as digits as its factorization.

238109831 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 10368, while the sum is 35.

The square root of 238109831 is about 15430.8078531229. The cubic root of 238109831 is about 619.8107564988.

The spelling of 238109831 in words is "two hundred thirty-eight million, one hundred nine thousand, eight hundred thirty-one".