Search a number
7071 = 32357
BaseRepresentation
bin1101110011111
3100200220
41232133
5211241
652423
726421
oct15637
910626
107071
115349
124113
1332ac
142811
152166
hex1b9f

7071 has 4 divisors (see below), whose sum is σ = 9432. Its totient is φ = 4712.

The previous prime is 7069. The next prime is 7079. The reversal of 7071 is 1707.

Added to its reverse (1707) it gives a triangular number (8778 = T132).

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 1707 = 3569.

It is a cyclic number.

It is not a de Polignac number, because 7071 - 21 = 7069 is a prime.

It is a D-number.

It is a self number, because there is not a number n which added to its sum of digits gives 7071.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (7079) 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, 1176 + ... + 1181.

It is an arithmetic number, because the mean of its divisors is an integer number (2358).

7071 is a deficient number, since it is larger than the sum of its proper divisors (2361).

7071 is a wasteful number, since it uses less digits than its factorization.

7071 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2360.

The product of its (nonzero) digits is 49, while the sum is 15.

The square root of 7071 is about 84.0892383126. The cubic root of 7071 is about 19.1937696799.

Subtracting from 7071 its sum of digits (15), we obtain a square (7056 = 842).

Adding to 7071 its reverse (1707), we get a palindrome (8778).

It can be divided in two parts, 70 and 71, that added together give a palindrome (141).

The spelling of 7071 in words is "seven thousand, seventy-one", and thus it is an iban number.

Divisors: 1 3 2357 7071