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Joe has found that just a few numbers have a rather unique property. Reverse the order of the digits, and the new number is a multiple of the original. For some specified numbers of digits (four or more) there are only two numbers with the property.

Joe gave Penny the task of finding the two 6-digit numbers.What is the lower 6-digit number?

WIN £15 will be awarded to the sender of the first correct answer opened on Monday 6 April. The Editor’s decision is final. Please send entries to Enigma 1535, ¿ìè¶ÌÊÓƵ, Lacon House, 84 Theobald’s Road, London WC1X 8NS, or to enigma@newscientist.com (please include your postal address).

Answer to 1529 Square corbel: (a) 13689 (b) 96721

The winner Richard Clay of Moonee Ponds, Victoria, Australia