2051899 has 4 divisors (see below), whose sum is σ = 2141136. Its totient is φ = 1962664.

The previous prime is 2051893. The next prime is 2051923. The reversal of 2051899 is 9981502.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 2051899 - 2³ = 2051891 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2051891) 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, 44584 + ... + 44629.

It is an arithmetic number, because the mean of its divisors is an integer number (535284).

2^2051899 is an apocalyptic number.

2051899 is a deficient number, since it is larger than the sum of its proper divisors (89237).

2051899 is an equidigital number, since it uses as much as digits as its factorization.

2051899 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 89236.

The product of its (nonzero) digits is 6480, while the sum is 34.

The square root of 2051899 is about 1432.4451123865. The cubic root of 2051899 is about 127.0726226095.

The spelling of 2051899 in words is "two million, fifty-one thousand, eight hundred ninety-nine".