2051749 has 4 divisors (see below), whose sum is σ = 2344864. Its totient is φ = 1758636.

The previous prime is 2051743. The next prime is 2051759. The reversal of 2051749 is 9471502.

It is a happy number.

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, and also an emirpimes, since its reverse is a distinct semiprime: 9471502 = 2 ⋅4735751.

It is a cyclic number.

It is not a de Polignac number, because 2051749 - 2¹⁵ = 2018981 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 (2051743) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 146547 + ... + 146560.

It is an arithmetic number, because the mean of its divisors is an integer number (586216).

2^2051749 is an apocalyptic number.

It is an amenable number.

2051749 is a deficient number, since it is larger than the sum of its proper divisors (293115).

2051749 is an equidigital number, since it uses as much as digits as its factorization.

2051749 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 293114.

The product of its (nonzero) digits is 2520, while the sum is 28.

The square root of 2051749 is about 1432.3927534025. The cubic root of 2051749 is about 127.0695260702.

The spelling of 2051749 in words is "two million, fifty-one thousand, seven hundred forty-nine".