238847681 has 2 divisors, whose sum is σ = 238847682. Its totient is φ = 238847680.

The previous prime is 238847669. The next prime is 238847737. The reversal of 238847681 is 186748832.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 233937025 + 4910656 = 15295^2 + 2216^2 .

It is a cyclic number.

It is not a de Polignac number, because 238847681 - 2¹⁴ = 238831297 is a prime.

It is a super-2 number, since 2×238847681² = 114096429438155522, which contains 22 as substring.

It is a Sophie Germain prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (238847611) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 119423840 + 119423841.

It is an arithmetic number, because the mean of its divisors is an integer number (119423841).

Almost surely, 2^238847681 is an apocalyptic number.

It is an amenable number.

238847681 is a deficient number, since it is larger than the sum of its proper divisors (1).

238847681 is an equidigital number, since it uses as much as digits as its factorization.

238847681 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 516096, while the sum is 47.

The square root of 238847681 is about 15454.6977000522. The cubic root of 238847681 is about 620.4503154097.

The spelling of 238847681 in words is "two hundred thirty-eight million, eight hundred forty-seven thousand, six hundred eighty-one".