2091001 has 8 divisors (see below), whose sum is σ = 2301408. Its totient is φ = 1899700.

The previous prime is 2090989. The next prime is 2091053. The reversal of 2091001 is 1001902.

2091001 = T₂₁₈ + T₂₁₉ + ... + T₂₈₃.

It is not a de Polignac number, because 2091001 - 2⁷ = 2090873 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2091301) 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 in 7 ways as a sum of consecutive naturals, for example, 546 + ... + 2116.

It is an arithmetic number, because the mean of its divisors is an integer number (287676).

2^2091001 is an apocalyptic number.

It is an amenable number.

2091001 is a deficient number, since it is larger than the sum of its proper divisors (210407).

2091001 is an equidigital number, since it uses as much as digits as its factorization.

2091001 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1604 (or 1582 counting only the distinct ones).

The product of its (nonzero) digits is 18, while the sum is 13.

The square root of 2091001 is about 1446.0293911259. The cubic root of 2091001 is about 127.8747350363.

Adding to 2091001 its reverse (1001902), we get a palindrome (3092903).

The spelling of 2091001 in words is "two million, ninety-one thousand, one".