2056511 has 4 divisors (see below), whose sum is σ = 2072832. Its totient is φ = 2040192.

The previous prime is 2056501. The next prime is 2056517. The reversal of 2056511 is 1156502.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 1156502 = 2 ⋅578251.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-2056511 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 (2056517) 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, 7970 + ... + 8223.

It is an arithmetic number, because the mean of its divisors is an integer number (518208).

2^2056511 is an apocalyptic number.

2056511 is a deficient number, since it is larger than the sum of its proper divisors (16321).

2056511 is a wasteful number, since it uses less digits than its factorization.

2056511 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16320.

The product of its (nonzero) digits is 300, while the sum is 20.

The square root of 2056511 is about 1434.0540436120. The cubic root of 2056511 is about 127.1677573104.

Subtracting from 2056511 its reverse (1156502), we obtain a palindrome (900009).

The spelling of 2056511 in words is "two million, fifty-six thousand, five hundred eleven".