2091749 has 4 divisors (see below), whose sum is σ = 2281920. Its totient is φ = 1901580.

The previous prime is 2091737. The next prime is 2091763. The reversal of 2091749 is 9471902.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 2091749 - 2²⁰ = 1043173 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2091709) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 95069 + ... + 95090.

It is an arithmetic number, because the mean of its divisors is an integer number (570480).

2^2091749 is an apocalyptic number.

It is an amenable number.

2091749 is a deficient number, since it is larger than the sum of its proper divisors (190171).

2091749 is a wasteful number, since it uses less digits than its factorization.

2091749 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 190170.

The product of its (nonzero) digits is 4536, while the sum is 32.

The square root of 2091749 is about 1446.2880072793. The cubic root of 2091749 is about 127.8899811470.

The spelling of 2091749 in words is "two million, ninety-one thousand, seven hundred forty-nine".