200138681 has 2 divisors, whose sum is σ = 200138682. Its totient is φ = 200138680.

The previous prime is 200138677. The next prime is 200138689. The reversal of 200138681 is 186831002.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 137475625 + 62663056 = 11725^2 + 7916^2 .

It is a cyclic number.

It is not a de Polignac number, because 200138681 - 2² = 200138677 is a prime.

It is a super-2 number, since 2×200138681² = 80110983264839522, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (200138689) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 100069340 + 100069341.

It is an arithmetic number, because the mean of its divisors is an integer number (100069341).

Almost surely, 2^200138681 is an apocalyptic number.

It is an amenable number.

200138681 is a deficient number, since it is larger than the sum of its proper divisors (1).

200138681 is an equidigital number, since it uses as much as digits as its factorization.

200138681 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2304, while the sum is 29.

The square root of 200138681 is about 14147.0378878407. The cubic root of 200138681 is about 584.9386849804.

Adding to 200138681 its reverse (186831002), we get a palindrome (386969683).

The spelling of 200138681 in words is "two hundred million, one hundred thirty-eight thousand, six hundred eighty-one".