201001109 has 2 divisors, whose sum is σ = 201001110. Its totient is φ = 201001108.

The previous prime is 201001067. The next prime is 201001153. The reversal of 201001109 is 901100102.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 197402500 + 3598609 = 14050^2 + 1897^2 .

It is a cyclic number.

It is not a de Polignac number, because 201001109 - 2⁸ = 201000853 is a prime.

It is a Chen prime.

It is equal to p_11131331 and since 201001109 and 11131331 have the same sum of digits, it is a Honaker prime.

It is a junction number, because it is equal to n+sod(n) for n = 201001093 and 201001102.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (201001159) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 100500554 + 100500555.

It is an arithmetic number, because the mean of its divisors is an integer number (100500555).

Almost surely, 2^201001109 is an apocalyptic number.

It is an amenable number.

201001109 is a deficient number, since it is larger than the sum of its proper divisors (1).

201001109 is an equidigital number, since it uses as much as digits as its factorization.

201001109 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 201001109 is about 14177.4859901183. The cubic root of 201001109 is about 585.7776775869. Note that the first 3 decimals are identical.

The spelling of 201001109 in words is "two hundred one million, one thousand, one hundred nine".