2103649 has 4 divisors (see below), whose sum is σ = 2195136. Its totient is φ = 2012164.

The previous prime is 2103617. The next prime is 2103653. The reversal of 2103649 is 9463012.

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 2103649 - 2⁵ = 2103617 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2103679) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 45709 + ... + 45754.

It is an arithmetic number, because the mean of its divisors is an integer number (548784).

2^2103649 is an apocalyptic number.

It is an amenable number.

2103649 is a deficient number, since it is larger than the sum of its proper divisors (91487).

2103649 is an equidigital number, since it uses as much as digits as its factorization.

2103649 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 91486.

The product of its (nonzero) digits is 1296, while the sum is 25.

The square root of 2103649 is about 1450.3961527803. The cubic root of 2103649 is about 128.1320455376.

The spelling of 2103649 in words is "two million, one hundred three thousand, six hundred forty-nine".