What is numbers 61?

1. 61 is a prime number.
2. 61 is the 18th prime number.
3. 61 is a twin prime with 59.
4. 61 is a Sophie Germain prime because 2*61+1=123 is also a prime.
5. 61 is a palindromic prime, meaning it is the same number when read forwards and backwards.
6. In base 10, 61 is a cyclic number. This means that when it is raised to a power, the last two digits of the result repeat in a cycle of length 60.
7. 61 is the sum of the first six prime numbers (2+3+5+7+11+13).
8. 61 is the only known prime number that is the sum of three cubes: 61=3^3+4^3+(-5)^3.
9. 61 is the atomic number of the element promethium.
10. In astrology, 61 is the number of Jupiter.