JSFiddle - React, Tailwind, and code Playground

HTML

<div id="text"></div>

JavaScript

$("#text").text(gimatria(613));

function gimatria(num) {
 
    var g = {
            100 : "קרשת",
            10 : "יכלמנסעפצ",
            1 : "אבגדהוזחט"
        };
 
    var str = ""; 
    for ( var key = 100; key >= 1; key /= 10) {
        for ( var i = g[key].length; i > 0; i--) {
            var v = i * key;
            while (num >= v) {
                str += g[key].charAt(i - 1);
                num -= v;
            }
        }
    }
 
    str = str.replace("י" + "ה", "טו");
    str = str.replace("י" + "ו", "טז");
 
    /*
     * 'רעב'=>'רבע' 'רצח'=>'רחצ'
     */
 
    if (str.length > 1)
        str = str.substring(0, str.length - 1) + "\""
                + str.substring(str.length - 1);
    else if (1 == str.length)
        str = str + "'";
 
    return str;
}