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2571 = 3857

2571 has 4 divisors (see below), whose sum is σ = 3432. Its totient is φ = 1712.

The previous prime is 2557. The next prime is 2579. The reversal of 2571 is 1752.

It is a happy number.

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 2571 - 25 = 2539 is a prime.

It is a super-2 number, since 2×25712 = 13220082, which contains 22 as substring.

It is a D-number.

2571 is a lucky number.

It is a plaindrome in base 9 and base 13.

It is a nialpdrome in base 15.

It is a self number, because there is not a number n which added to its sum of digits gives 2571.

It is not an unprimeable number, because it can be changed into a prime (2579) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (5) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 426 + ... + 431.

It is an arithmetic number, because the mean of its divisors is an integer number (858).

2571 is a deficient number, since it is larger than the sum of its proper divisors (861).

2571 is an equidigital number, since it uses as much as digits as its factorization.

2571 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 860.

The product of its digits is 70, while the sum is 15.

The square root of 2571 is about 50.7050293363. The cubic root of 2571 is about 13.6993730510.

Subtracting from 2571 its sum of digits (15), we obtain a triangular number (2556 = T71).

The spelling of 2571 in words is "two thousand, five hundred seventy-one".

Divisors: 1 3 857 2571