201101081 has 2 divisors, whose sum is σ = 201101082. Its totient is φ = 201101080.

The previous prime is 201101077. The next prime is 201101083. The reversal of 201101081 is 180101102.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 157276681 + 43824400 = 12541^2 + 6620^2 .

It is a cyclic number.

It is not a de Polignac number, because 201101081 - 2² = 201101077 is a prime.

It is a super-2 number, since 2×201101081² = 80883289558737122, which contains 22 as substring.

Together with 201101083, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (201101083) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 100550540 + 100550541.

It is an arithmetic number, because the mean of its divisors is an integer number (100550541).

Almost surely, 2^201101081 is an apocalyptic number.

It is an amenable number.

201101081 is a deficient number, since it is larger than the sum of its proper divisors (1).

201101081 is an equidigital number, since it uses as much as digits as its factorization.

201101081 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 16, while the sum is 14.

The square root of 201101081 is about 14181.0112826977. The cubic root of 201101081 is about 585.8747776478.

Adding to 201101081 its reverse (180101102), we get a palindrome (381202183).

The spelling of 201101081 in words is "two hundred one million, one hundred one thousand, eighty-one".