A four-digit number, the number in the thousands place is 5 times the number in the ones place, the number in the hundreds place is equal to the sum of the number in the thousands place and the number in the ones place, and the number in the tens place is equal to the number in the thousands place The difference from the number in the ones place. What is this four-digit number?
一个四位数，千位上的数字是个位上的数字的5倍，百位上的数字等于千位上的数字与个位上的数字的和，十位上的数字等于千位上的数字与个位上的数字的差．这个四位数是多少？
<result>5_641</result>