2001091 has 8 divisors (see below), whose sum is σ = 2067120. Its totient is φ = 1936032.

The previous prime is 2001079. The next prime is 2001101. The reversal of 2001091 is 1901002.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 2001091 - 2⁷ = 2000963 is a prime.

It is a Duffinian number.

2001091 is a lucky number.

It is not an unprimeable number, because it can be changed into a prime (2001191) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 7305 + ... + 7573.

It is an arithmetic number, because the mean of its divisors is an integer number (258390).

2^2001091 is an apocalyptic number.

2001091 is a deficient number, since it is larger than the sum of its proper divisors (66029).

2001091 is a wasteful number, since it uses less digits than its factorization.

2001091 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 485.

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

The square root of 2001091 is about 1414.5992365331. The cubic root of 2001091 is about 126.0150103895.

Adding to 2001091 its reverse (1901002), we get a palindrome (3902093).

The spelling of 2001091 in words is "two million, one thousand, ninety-one".