2051815 has 16 divisors (see below), whose sum is σ = 2643840. Its totient is φ = 1523200.

The previous prime is 2051801. The next prime is 2051821. The reversal of 2051815 is 5181502.

It is not a de Polignac number, because 2051815 - 2¹⁵ = 2019047 is a prime.

It is a plaindrome in base 13.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 8466 + ... + 8704.

It is an arithmetic number, because the mean of its divisors is an integer number (165240).

2^2051815 is an apocalyptic number.

2051815 is a deficient number, since it is larger than the sum of its proper divisors (592025).

2051815 is a wasteful number, since it uses less digits than its factorization.

2051815 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 362.

The product of its (nonzero) digits is 400, while the sum is 22.

The square root of 2051815 is about 1432.4157915913. The cubic root of 2051815 is about 127.0708885661.

The spelling of 2051815 in words is "two million, fifty-one thousand, eight hundred fifteen".