2056557 has 4 divisors (see below), whose sum is σ = 2742080. Its totient is φ = 1371036.

The previous prime is 2056553. The next prime is 2056573. The reversal of 2056557 is 7556502.

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.

It is not a de Polignac number, because 2056557 - 2² = 2056553 is a prime.

It is a D-number.

It is a Duffinian number.

2056557 is a lucky number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2056553) 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, 342757 + ... + 342762.

It is an arithmetic number, because the mean of its divisors is an integer number (685520).

2^2056557 is an apocalyptic number.

It is an amenable number.

2056557 is a deficient number, since it is larger than the sum of its proper divisors (685523).

2056557 is an equidigital number, since it uses as much as digits as its factorization.

2056557 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 685522.

The product of its (nonzero) digits is 10500, while the sum is 30.

The square root of 2056557 is about 1434.0700819695. The cubic root of 2056557 is about 127.1687054654.

Subtracting 2056557 from its reverse (7556502), we obtain a palindrome (5499945).

The spelling of 2056557 in words is "two million, fifty-six thousand, five hundred fifty-seven".