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7145 = 51429
BaseRepresentation
bin1101111101001
3100210122
41233221
5212040
653025
726555
oct15751
910718
107145
115406
124175
133338
142865
1521b5
hex1be9

7145 has 4 divisors (see below), whose sum is σ = 8580. Its totient is φ = 5712.

The previous prime is 7129. The next prime is 7151. The reversal of 7145 is 5417.

Subtracting from 7145 its reverse (5417), we obtain a cube (1728 = 123).

It can be divided in two parts, 714 and 5, that multiplied together give a triangular number (3570 = T84).

It is a happy number.

7145 is nontrivially palindromic in base 8.

7145 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.

It can be written as a sum of positive squares in 2 ways, for example, as 1369 + 5776 = 37^2 + 76^2 .

It is a cyclic number.

It is not a de Polignac number, because 7145 - 24 = 7129 is a prime.

It is a plaindrome in base 13.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 710 + ... + 719.

It is an arithmetic number, because the mean of its divisors is an integer number (2145).

27145 is an apocalyptic number.

It is an amenable number.

7145 is a deficient number, since it is larger than the sum of its proper divisors (1435).

7145 is a wasteful number, since it uses less digits than its factorization.

7145 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1434.

The product of its digits is 140, while the sum is 17.

The square root of 7145 is about 84.5281018360. The cubic root of 7145 is about 19.2604935198.

The spelling of 7145 in words is "seven thousand, one hundred forty-five".

Divisors: 1 5 1429 7145