201109081 has 2 divisors, whose sum is σ = 201109082. Its totient is φ = 201109080.

The previous prime is 201109063. The next prime is 201109109. The reversal of 201109081 is 180901102.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 104755225 + 96353856 = 10235^2 + 9816^2 .

It is a cyclic number.

It is not a de Polignac number, because 201109081 - 2¹¹ = 201107033 is a prime.

It is a super-2 number, since 2×201109081² = 80889724921329122, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (201109681) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 100554540 + 100554541.

It is an arithmetic number, because the mean of its divisors is an integer number (100554541).

Almost surely, 2^201109081 is an apocalyptic number.

It is an amenable number.

201109081 is a deficient number, since it is larger than the sum of its proper divisors (1).

201109081 is an equidigital number, since it uses as much as digits as its factorization.

201109081 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 144, while the sum is 22.

The square root of 201109081 is about 14181.2933472233. The cubic root of 201109081 is about 585.8825464376.

The spelling of 201109081 in words is "two hundred one million, one hundred nine thousand, eighty-one".