1801091 has 2 divisors, whose sum is σ = 1801092. Its totient is φ = 1801090.

The previous prime is 1801073. The next prime is 1801109. The reversal of 1801091 is 1901081.

Together with next prime (1801109) it forms an Ormiston pair, because they use the same digits, order apart.

It is a balanced prime because it is at equal distance from previous prime (1801073) and next prime (1801109).

It is a cyclic number.

It is not a de Polignac number, because 1801091 - 2¹⁰ = 1800067 is a prime.

It is not a weakly prime, because it can be changed into another prime (1801021) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 900545 + 900546.

It is an arithmetic number, because the mean of its divisors is an integer number (900546).

2^1801091 is an apocalyptic number.

1801091 is a deficient number, since it is larger than the sum of its proper divisors (1).

1801091 is an equidigital number, since it uses as much as digits as its factorization.

1801091 is an odious number, because the sum of its binary digits is odd.

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

The square root of 1801091 is about 1342.0473166025. The cubic root of 1801091 is about 121.6686115492.

The spelling of 1801091 in words is "one million, eight hundred one thousand, ninety-one".