Compare 1980 vs 1991

Property	1980	1991
Type	composite number	semiprime
Unique factors	4	2
Total factors	6	2
Prime factorization	2² × 3² × 5¹ × 11¹	11¹ × 181¹
Prime factorization	2 × 2 × 3 × 3 × 5 × 11	11 × 181
Divisors count	36	4
Divisors	1, 2, 3, 4, 5, 6, 9, 10, 11, 12, 15, 18, 20, 22, 30, 33, 36, 44, 45, 55, 60, 66, 90, 99, 110, 132, 165, 180, 198, 220, 330, 396, 495, 660, 990, 1980	1, 11, 181, 1991
Number of properties	0	1
Semiprimes		576th
Roman numberals	MCMLXXX	MCMXCI
Base 2	11110111100₂	11111000111₂
Base 3	2201100₃	2201202₃
Base 4	132330₄	133013₄
Base 5	30410₅	30431₅
Base 6	13100₆	13115₆
Base 7	5526₇	5543₇
Base 8	3674₈	3707₈
Base 9	2640₉	2652₉
Base 10	1980₁₀	1991₁₀
Base 11	1540₁₁	1550₁₁
Base 12	1190₁₂	119b₁₂
Base 13	b94₁₃	ba2₁₃
Base 14	a16₁₄	a23₁₄
Base 15	8c0₁₅	8cb₁₅
Base 16	7bc₁₆	7c7₁₆