201101009 has 2 divisors, whose sum is σ = 201101010. Its totient is φ = 201101008.

The previous prime is 201101003. The next prime is 201101059. The reversal of 201101009 is 900101102.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 199600384 + 1500625 = 14128^2 + 1225^2 .

It is a cyclic number.

It is not a de Polignac number, because 201101009 - 2¹² = 201096913 is a prime.

It is a Sophie Germain prime.

It is a Chen prime.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 201100984 and 201101002.

It is not a weakly prime, because it can be changed into another prime (201101003) 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, 100550504 + 100550505.

It is an arithmetic number, because the mean of its divisors is an integer number (100550505).

Almost surely, 2^201101009 is an apocalyptic number.

It is an amenable number.

201101009 is a deficient number, since it is larger than the sum of its proper divisors (1).

201101009 is an equidigital number, since it uses as much as digits as its factorization.

201101009 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 18, while the sum is 14.

The square root of 201101009 is about 14181.0087440915. The cubic root of 201101009 is about 585.8747077277.

The spelling of 201101009 in words is "two hundred one million, one hundred one thousand, nine".