Search a number
-
+
7031 = 7989
BaseRepresentation
bin1101101110111
3100122102
41231313
5211111
652315
726333
oct15567
910572
107031
115312
12409b
13327b
1427c3
15213b
hex1b77

7031 has 4 divisors (see below), whose sum is σ = 7200. Its totient is φ = 6864.

The previous prime is 7027. The next prime is 7039. The reversal of 7031 is 1307.

Adding to 7031 its reverse (1307), we get a palindrome (8338).

It can be divided in two parts, 70 and 31, that added together give a palindrome (101).

7031 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

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.

It is a cyclic number.

It is not a de Polignac number, because 7031 - 22 = 7027 is a prime.

It is a super-2 number, since 2×70312 = 98869922, which contains 22 as substring.

It is a Duffinian number.

It is a plaindrome in base 8.

It is a nialpdrome in base 5.

It is a congruent number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 7031.

It is not an unprimeable number, because it can be changed into a prime (7039) 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, 35 + ... + 123.

It is an arithmetic number, because the mean of its divisors is an integer number (1800).

27031 is an apocalyptic number.

7031 is the 38-th centered decagonal number.

7031 is a deficient number, since it is larger than the sum of its proper divisors (169).

7031 is an equidigital number, since it uses as much as digits as its factorization.

7031 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 168.

The product of its (nonzero) digits is 21, while the sum is 11.

The square root of 7031 is about 83.8510584310. The cubic root of 7031 is about 19.1575087525.

The spelling of 7031 in words is "seven thousand, thirty-one".

Divisors: 1 79 89 7031