2091549 has 8 divisors (see below), whose sum is σ = 2803680. Its totient is φ = 1386896.

The previous prime is 2091521. The next prime is 2091553. The reversal of 2091549 is 9451902.

It is a happy number.

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

It is a cyclic number.

It is not a de Polignac number, because 2091549 - 2⁷ = 2091421 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2091599) 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, 1179 + ... + 2360.

It is an arithmetic number, because the mean of its divisors is an integer number (350460).

2^2091549 is an apocalyptic number.

It is an amenable number.

2091549 is a deficient number, since it is larger than the sum of its proper divisors (712131).

2091549 is a wasteful number, since it uses less digits than its factorization.

2091549 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3739.

The product of its (nonzero) digits is 3240, while the sum is 30.

The square root of 2091549 is about 1446.2188631048. The cubic root of 2091549 is about 127.8859050029.

The spelling of 2091549 in words is "two million, ninety-one thousand, five hundred forty-nine".