math_fact: 9158 is a value of n for which n and 8n together use each digit 1-9 exactly once.
trivia: 9158 is a boring number.
historical_date: January 26th is the day in 1905 that the world's largest diamond ever, the Cullinan weighing 3,106.75 carats (0.62135 kg), is found at the Premier Mine near Pretoria in South Africa.