2051869 has 4 divisors (see below), whose sum is σ = 2058400. Its totient is φ = 2045340.

The previous prime is 2051851. The next prime is 2051887. The reversal of 2051869 is 9681502.

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: 9681502 = 2 ⋅4840751.

It is an interprime number because it is at equal distance from previous prime (2051851) and next prime (2051887).

It is a cyclic number.

It is not a de Polignac number, because 2051869 - 2¹¹ = 2049821 is a prime.

It is a super-2 number, since 2×2051869² = 8420332786322, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 2051869.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2051839) 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, 2769 + ... + 3430.

It is an arithmetic number, because the mean of its divisors is an integer number (514600).

2^2051869 is an apocalyptic number.

It is an amenable number.

2051869 is a deficient number, since it is larger than the sum of its proper divisors (6531).

2051869 is an equidigital number, since it uses as much as digits as its factorization.

2051869 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6530.

The product of its (nonzero) digits is 4320, while the sum is 31.

The square root of 2051869 is about 1432.4346407428. The cubic root of 2051869 is about 127.0720033137.

The spelling of 2051869 in words is "two million, fifty-one thousand, eight hundred sixty-nine".