2056551571 has 4 divisors (see below), whose sum is σ = 2056657144. Its totient is φ = 2056446000.

The previous prime is 2056551529. The next prime is 2056551587. The reversal of 2056551571 is 1751556502.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length, and also an emirpimes, since its reverse is a distinct semiprime: 1751556502 = 2 ⋅875778251.

It is a cyclic number.

It is not a de Polignac number, because 2056551571 - 2²¹ = 2054454419 is a prime.

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 2056551571.

It is not an unprimeable number, because it can be changed into a prime (2056551271) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 14130 + ... + 65671.

It is an arithmetic number, because the mean of its divisors is an integer number (514164286).

Almost surely, 2^2056551571 is an apocalyptic number.

2056551571 is a deficient number, since it is larger than the sum of its proper divisors (105573).

2056551571 is an equidigital number, since it uses as much as digits as its factorization.

2056551571 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 105572.

The product of its (nonzero) digits is 52500, while the sum is 37.

The square root of 2056551571 is about 45349.2179756167. The cubic root of 2056551571 is about 1271.6859356323.

The spelling of 2056551571 in words is "two billion, fifty-six million, five hundred fifty-one thousand, five hundred seventy-one".