2091901 has 8 divisors (see below), whose sum is σ = 2531520. Its totient is φ = 1687488.

The previous prime is 2091889. The next prime is 2091913. The reversal of 2091901 is 1091902.

It is an interprime number because it is at equal distance from previous prime (2091889) and next prime (2091913).

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

It is not a de Polignac number, because 2091901 - 2⁷ = 2091773 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2091931) 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, 8671 + ... + 8908.

It is an arithmetic number, because the mean of its divisors is an integer number (316440).

2^2091901 is an apocalyptic number.

It is an amenable number.

2091901 is a deficient number, since it is larger than the sum of its proper divisors (439619).

2091901 is a wasteful number, since it uses less digits than its factorization.

2091901 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17603.

The product of its (nonzero) digits is 162, while the sum is 22.

The square root of 2091901 is about 1446.3405546413. The cubic root of 2091901 is about 127.8930788428.

Subtracting from 2091901 its reverse (1091902), we obtain a palindrome (999999).

It can be divided in two parts, 2091 and 901, that added together give a palindrome (2992).

The spelling of 2091901 in words is "two million, ninety-one thousand, nine hundred one".