2056171587 has 4 divisors (see below), whose sum is σ = 2741562120. Its totient is φ = 1370781056.

The previous prime is 2056171567. The next prime is 2056171597. The reversal of 2056171587 is 7851716502.

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 2056171587 - 2⁷ = 2056171459 is a prime.

It is not an unprimeable number, because it can be changed into a prime (2056171567) 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, 342695262 + ... + 342695267.

It is an arithmetic number, because the mean of its divisors is an integer number (685390530).

Almost surely, 2^2056171587 is an apocalyptic number.

2056171587 is a deficient number, since it is larger than the sum of its proper divisors (685390533).

2056171587 is an equidigital number, since it uses as much as digits as its factorization.

2056171587 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 685390532.

The product of its (nonzero) digits is 117600, while the sum is 42.

The square root of 2056171587 is about 45345.0282500739. The cubic root of 2056171587 is about 1271.6076087088.

The spelling of 2056171587 in words is "two billion, fifty-six million, one hundred seventy-one thousand, five hundred eighty-seven".