1801109 has 2 divisors, whose sum is σ = 1801110. Its totient is φ = 1801108.

The previous prime is 1801091. The next prime is 1801117. The reversal of 1801109 is 9011081.

Together with previous prime (1801091) it forms an Ormiston pair, because they use the same digits, order apart.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1030225 + 770884 = 1015^2 + 878^2 .

It is an emirp because it is prime and its reverse (9011081) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1801109 - 2⁸ = 1800853 is a prime.

It is a Chen prime.

It is a plaindrome in base 15.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1801309) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 900554 + 900555.

It is an arithmetic number, because the mean of its divisors is an integer number (900555).

2^1801109 is an apocalyptic number.

It is an amenable number.

1801109 is a deficient number, since it is larger than the sum of its proper divisors (1).

1801109 is an equidigital number, since it uses as much as digits as its factorization.

1801109 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 72, while the sum is 20.

The square root of 1801109 is about 1342.0540227577. The cubic root of 1801109 is about 121.6690168642.

The spelling of 1801109 in words is "one million, eight hundred one thousand, one hundred nine".